Repository: stable-diffusion-webui
Issue: [Bug]: Unable to merge checkpoints
Labels: bug-report

### Is there an existing issue for this?

- [X] I have searched the existing issues and checked the recent builds/commits

### What happened?

I receive an error message when I try to merge checkpoints. 

### Steps to reproduce the problem

1. Go to checkpoint merger
2. Select your checkpoints to merge, press merge. 
3. Error occurs.


### What should have happened?

Merged checkpoint should have been created. 

### Sysinfo

{
    "Platform": "Windows-10-10.0.22621-SP0",
    "Python": "3.10.6",
    "Version": "v1.6.0-2-g4afaaf8a",
    "Commit": "4afaaf8a020c1df457bcf7250cb1c7f609699fa7",
    "Script path": "C:\\stablediffusion",
    "Data path": "C:\\stablediffusion",
    "Extensions dir": "C:\\stablediffusion\\extensions",
    "Checksum": "e824bbcc33a938131e3cccff9661b381394b7f9ad194e74b3e77e5f9e3e76593",
    "Commandline": [
        "launch.py"
    ],
    "Torch env info": {
        "torch_version": "2.0.1+cu118",
        "is_debug_build": "False",
        "cuda_compiled_version": "11.8",
        "gcc_version": null,
        "clang_version": null,
        "cmake_version": null,
        "os": "Microsoft Windows 11 Home",
        "libc_version": "N/A",
        "python_version": "3.10.6 (tags/v3.10.6:9c7b4bd, Aug  1 2022, 21:53:49) [MSC v.1932 64 bit (AMD64)] (64-bit runtime)",
        "python_platform": "Windows-10-10.0.22621-SP0",
        "is_cuda_available": "True",
        "cuda_runtime_version": "11.8.89\r",
        "cuda_module_loading": "LAZY",
        "nvidia_driver_version": "546.17",
        "nvidia_gpu_models": "GPU 0: NVIDIA GeForce RTX 4090",
        "cudnn_version": null,
        "pip_version": "pip3",
        "pip_packages": [
            "numpy==1.23.5",
            "open-clip-torch==2.20.0",
            "pytorch-lightning==1.9.4",
            "torch==2.0.1+cu118",
            "torchdiffeq==0.2.3",
            "torchmetrics==1.2.0",
            "torchsde==0.2.5",
            "torchvision==0.15.2+cu118"
        ],
        "conda_packages": null,
        "hip_compiled_version": "N/A",
        "hip_runtime_version": "N/A",
        "miopen_runtime_version": "N/A",
        "caching_allocator_config": "",
        "is_xnnpack_available": "True",
        "cpu_info": [
            "Architecture=9",
            "CurrentClockSpeed=3500",
            "DeviceID=CPU0",
            "Family=205",
            "L2CacheSize=20480",
            "L2CacheSpeed=",
            "Manufacturer=GenuineIntel",
            "MaxClockSpeed=3500",
            "Name=13th Gen Intel(R) Core(TM) i5-13600KF",
            "ProcessorType=3",
            "Revision="
        ]
    },
    "Exceptions": [
        {
            "exception": "A tensor with all NaNs was produced in VAE. This could be because there's not enough precision to represent the picture. Try adding --no-half-vae commandline argument to fix this. Use --disable-nan-check commandline argument to disable this check.",
            "traceback": [
                [
                    "C:\\stablediffusion\\modules\\processing.py, line 598, decode_latent_batch",
                    "devices.test_for_nans(sample, \"vae\")"
                ],
                [
                    "C:\\stablediffusion\\modules\\devices.py, line 136, test_for_nans",
                    "raise NansException(message)"
                ]
            ]
        },
        {
            "exception": "argument 'metadata': 'dict' object cannot be converted to 'PyString'",
            "traceback": [
                [
                    "C:\\stablediffusion\\modules\\ui_checkpoint_merger.py, line 21, modelmerger",
                    "results = extras.run_modelmerger(*args)"
                ],
                [
                    "C:\\stablediffusion\\modules\\extras.py, line 315, run_modelmerger",
                    "safetensors.torch.save_file(theta_0, output_modelname, metadata=metadata if len(metadata)>0 else None)"
                ],
                [
                    "C:\\stablediffusion\\venv\\lib\\site-packages\\safetensors\\torch.py, line 232, save_file",
                    "serialize_file(_flatten(tensors), filename, metadata=metadata)"
                ]
            ]
        }
    ],
    "CPU": {
        "model": "Intel64 Family 6 Model 183 Stepping 1, GenuineIntel",
        "count logical": 20,
        "count physical": 14
    },
    "RAM": {
        "total": "64GB",
        "used": "22GB",
        "free": "42GB"
    },
    "Extensions": [],
    "Inactive extensions": [],
    "Environment": {
        "GRADIO_ANALYTICS_ENABLED": "False",
        "PYTHONPATH": "C:\\Users\\joebb\\anaconda3"
    },
    "Config": {
        "samples_save": true,
        "samples_format": "png",
        "samples_filename_pattern": "",
        "save_images_add_number": true,
        "grid_save": true,
        "grid_format": "png",
        "grid_extended_filename": false,
        "grid_only_if_multiple": true,
        "grid_prevent_empty_spots": false,
        "grid_zip_filename_pattern": "",
        "n_rows": -1,
        "font": "",
        "grid_text_active_color": "#000000",
        "grid_text_inactive_color": "#999999",
        "grid_background_color": "#ffffff",
        "enable_pnginfo": true,
        "save_txt": false,
        "save_images_before_face_restoration": false,
        "save_images_before_highres_fix": false,
        "save_images_before_color_correction": false,
        "save_mask": false,
        "save_mask_composite": false,
        "jpeg_quality": 80,
        "webp_lossless": false,
        "export_for_4chan": true,
        "img_downscale_threshold": 4.0,
        "target_side_length": 4000,
        "img_max_size_mp": 200,
        "use_original_name_batch": true,
        "use_upscaler_name_as_suffix": false,
        "save_selected_only": true,
        "save_init_img": false,
        "temp_dir": "",
        "clean_temp_dir_at_start": false,
        "save_incomplete_images": false,
        "outdir_samples": "",
        "outdir_txt2img_samples": "outputs/txt2img-images",
        "outdir_img2img_samples": "outputs/img2img-images",
        "outdir_extras_samples": "outputs/extras-images",
        "outdir_grids": "",
        "outdir_txt2img_grids": "outputs/txt2img-grids",
        "outdir_img2img_grids": "outputs/img2img-grids",
        "outdir_save": "log/images",
        "outdir_init_images": "outputs/init-images",
        "save_to_dirs": true,
        "grid_save_to_dirs": true,
        "use_save_to_dirs_for_ui": false,
        "directories_filename_pattern": "[date]",
        "directories_max_prompt_words": 8,
        "ESRGAN_tile": 192,
        "ESRGAN_tile_overlap": 8,
        "realesrgan_enabled_models": [
            "R-ESRGAN 4x+",
            "R-ESRGAN 4x+ Anime6B"
        ],
        "upscaler_for_img2img": null,
        "face_restoration": false,
        "face_restoration_model": "CodeFormer",
        "code_former_weight": 0.5,
        "face_restoration_unload": false,
        "auto_launch_browser": "Local",
        "show_warnings": false,
        "show_gradio_deprecation_warnings": true,
        "memmon_poll_rate": 8,
        "samples_log_stdout": false,
        "multiple_tqdm": true,
        "print_hypernet_extra": false,
        "list_hidden_files": true,
        "disable_mmap_load_safetensors": false,
        "hide_ldm_prints": true,
        "api_enable_requests": true,
        "api_forbid_local_requests": true,
        "api_useragent": "",
        "unload_models_when_training": false,
        "pin_memory": false,
        "save_optimizer_state": false,
        "save_training_settings_to_txt": true,
        "dataset_filename_word_regex": "",
        "dataset_filename_join_string": " ",
        "training_image_repeats_per_epoch": 1,
        "training_write_csv_every": 500,
        "training_xattention_optimizations": false,
        "training_enable_tensorboard": false,
        "training_tensorboard_save_images": false,
        "training_tensorboard_flush_every": 120,
        "sd_model_checkpoint": "Halcyon v13.safetensors [bc1260f896]",
        "sd_checkpoints_limit": 1,
        "sd_checkpoints_keep_in_cpu": true,
        "sd_checkpoint_cache": 0,
        "sd_unet": "Automatic",
        "enable_quantization": false,
        "enable_emphasis": true,
        "enable_batch_seeds": true,
        "comma_padding_backtrack": 20,
        "CLIP_stop_at_last_layers": 1,
        "upcast_attn": false,
        "randn_source": "GPU",
        "tiling": false,
        "hires_fix_refiner_pass": "second pass",
        "sdxl_crop_top": 0,
        "sdxl_crop_left": 0,
        "sdxl_refiner_low_aesthetic_score": 2.5,
        "sdxl_refiner_high_aesthetic_score": 6.0,
        "sd_vae_explanation": "<abbr title='Variational autoencoder'>VAE</abbr> is a neural network that transforms a standard <abbr title='red/green/blue'>RGB</abbr>\nimage into latent space representation and back. Latent space representation is what stable diffusion is working on during sampling\n(i.e. when the progress bar is between empty and full). For txt2img, VAE is used to create a resulting image after the sampling is finished.\nFor img2img, VAE is used to process user's input image before the sampling, and to create an image after sampling.",
        "sd_vae_checkpoint_cache": 0,
        "sd_vae": "Automatic",
        "sd_vae_overrides_per_model_preferences": true,
        "auto_vae_precision": true,
        "sd_vae_encode_method": "Full",
        "sd_vae_decode_method": "Full",
        "inpainting_mask_weight": 1.0,
        "initial_noise_multiplier": 1.0,
        "img2img_extra_noise": 0.0,
        "img2img_color_correction": false,
        "img2img_fix_steps": false,
        "img2img_background_color": "#ffffff",
        "img2img_editor_height": 720,
        "img2img_sketch_default_brush_color": "#ffffff",
        "img2img_inpaint_mask_brush_color": "#ffffff",
        "img2img_inpaint_sketch_default_brush_color": "#ffffff",
        "return_mask": false,
        "return_mask_composite": false,
        "cross_attention_optimization": "Automatic",
        "s_min_uncond": 0.0,
        "token_merging_ratio": 0.0,
        "token_merging_ratio_img2img": 0.0,
        "token_merging_ratio_hr": 0.0,
        "pad_cond_uncond": false,
        "persistent_cond_cache": true,
        "batch_cond_uncond": true,
        "use_old_emphasis_implementation": false,
        "use_old_karras_scheduler_sigmas": false,
        "no_dpmpp_sde_batch_determinism": false,
        "use_old_hires_fix_width_height": false,
        "dont_fix_second_order_samplers_schedule": false,
        "hires_fix_use_firstpass_conds": false,
        "use_old_scheduling": false,
        "interrogate_keep_models_in_memory": false,
        "interrogate_return_ranks": false,
        "interrogate_clip_num_beams": 1,
        "interrogate_clip_min_length": 24,
        "interrogate_clip_max_length": 48,
        "interrogate_clip_dict_limit": 1500,
        "interrogate_clip_skip_categories": [],
        "interrogate_deepbooru_score_threshold": 0.5,
        "deepbooru_sort_alpha": true,
        "deepbooru_use_spaces": true,
        "deepbooru_escape": true,
        "deepbooru_filter_tags": "",
        "extra_networks_show_hidden_directories": true,
        "extra_networks_hidden_models": "When searched",
        "extra_networks_default_multiplier": 1.0,
        "extra_networks_card_width": 0,
        "extra_networks_card_height": 0,
        "extra_networks_card_text_scale": 1.0,
        "extra_networks_card_show_desc": true,
        "extra_networks_add_text_separator": " ",
        "ui_extra_networks_tab_reorder": "",
        "textual_inversion_print_at_load": false,
        "textual_inversion_add_hashes_to_infotext": true,
        "sd_hypernetwork": "None",
        "localization": "None",
        "gradio_theme": "Default",
        "gradio_themes_cache": true,
        "gallery_height": "",
        "return_grid": true,
        "do_not_show_images": false,
        "send_seed": true,
        "send_size": true,
        "js_modal_lightbox": true,
        "js_modal_lightbox_initially_zoomed": true,
        "js_modal_lightbox_gamepad": false,
        "js_modal_lightbox_gamepad_repeat": 250,
        "show_progress_in_title": true,
        "samplers_in_dropdown": true,
        "dimensions_and_batch_together": true,
        "keyedit_precision_attention": 0.1,
        "keyedit_precision_extra": 0.05,
        "keyedit_delimiters": ".,\\/!?%^*;:{}=`~()",
        "keyedit_move": true,
        "quicksettings_list": [
            "sd_model_checkpoint"
        ],
        "ui_tab_order": [],
        "hidden_tabs": [],
        "ui_reorder_list": [],
        "hires_fix_show_sampler": false,
        "hires_fix_show_prompts": false,
        "disable_token_counters": false,
        "add_model_hash_to_info": true,
        "add_model_name_to_info": true,
        "add_user_name_to_info": false,
        "add_version_to_infotext": true,
        "disable_weights_auto_swap": true,
        "infotext_styles": "Apply if any",
        "show_progressbar": true,
        "live_previews_enable": true,
        "live_previews_image_format": "png",
        "show_progress_grid": true,
        "show_progress_every_n_steps": 10,
        "show_progress_type": "Approx NN",
        "live_preview_allow_lowvram_full": false,
        "live_preview_content": "Prompt",
        "live_preview_refresh_period": 1000,
        "live_preview_fast_interrupt": false,
        "hide_samplers": [],
        "eta_ddim": 0.0,
        "eta_ancestral": 1.0,
        "ddim_discretize": "uniform",
        "s_churn": 0.0,
        "s_tmin": 0.0,
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        "s_noise": 1.0,
        "k_sched_type": "Automatic",
        "sigma_min": 0.0,
        "sigma_max": 0.0,
        "rho": 0.0,
        "eta_noise_seed_delta": 0,
        "always_discard_next_to_last_sigma": false,
        "sgm_noise_multiplier": false,
        "uni_pc_variant": "bh1",
        "uni_pc_skip_type": "time_uniform",
        "uni_pc_order": 3,
        "uni_pc_lower_order_final": true,
        "postprocessing_enable_in_main_ui": [],
        "postprocessing_operation_order": [],
        "upscaling_max_images_in_cache": 5,
        "disabled_extensions": [],
        "disable_all_extensions": "none",
        "restore_config_state_file": "",
        "sd_checkpoint_hash": "bc1260f8967c181a78ed74d74125b6045a1c1de26a257a899c8ba3d49e1aa970"
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        "total": 6.553263425827026,
        "records": {
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            "prepare environment/checks": 0.009728193283081055,
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            "prepare environment/torch GPU test": 1.309422492980957,
            "prepare environment/clone repositores": 0.10715436935424805,
            "prepare environment/run extensions installers": 0.0019989013671875,
            "prepare environment": 1.497004508972168,
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            "setup paths": 0.517737627029419,
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            "initialize shared": 0.16675829887390137,
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            "opts onchange": 0.0,
            "setup SD model": 0.0005056858062744141,
            "setup codeformer": 0.07606053352355957,
            "setup gfpgan": 0.013510704040527344,
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            "restore config state file": 0.0,
            "list SD models": 0.002498626708984375,
            "list localizations": 0.0010008811950683594,
            "load scripts/custom_code.py": 0.0009996891021728516,
            "load scripts/img2imgalt.py": 0.0,
            "load scripts/loopback.py": 0.00099945068359375,
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            "load scripts/postprocessing_codeformer.py": 0.0,
            "load scripts/postprocessing_gfpgan.py": 0.0010001659393310547,
            "load scripts/postprocessing_upscale.py": 0.0,
            "load scripts/prompt_matrix.py": 0.0,
            "load scripts/prompts_from_file.py": 0.0,
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            "load scripts/sd_upscale.py": 0.0009999275207519531,
            "load scripts/seed.py": 0.0,
            "load scripts/xyz_grid.py": 0.0009996891021728516,
            "load scripts/ldsr_model.py": 0.39255309104919434,
            "load scripts/lora_script.py": 0.0695643424987793,
            "load scripts/scunet_model.py": 0.014084100723266602,
            "load scripts/swinir_model.py": 0.012508869171142578,
            "load scripts/hotkey_config.py": 0.0,
            "load scripts/extra_options_section.py": 0.0,
            "load scripts": 0.4937093257904053,
            "load upscalers": 0.00610661506652832,
            "refresh VAE": 0.0009989738464355469,
            "refresh textual inversion templates": 0.0,
            "scripts list_optimizers": 0.0,
            "scripts list_unets": 0.0,
            "reload hypernetworks": 0.0009999275207519531,
            "initialize extra networks": 0.012509346008300781,
            "scripts before_ui_callback": 0.0009996891021728516,
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            "gradio launch": 0.2950608730316162,
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            "app_started_callback/lora_script.py": 0.0,
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    "Packages": [
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        "addict==2.4.0",
        "aenum==3.1.15",
        "aiofiles==23.2.1",
        "aiohttp==3.9.0",
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        "oauthlib==3.2.2",
        "omegaconf==2.2.3",
        "open-clip-torch==2.20.0",
        "opencv-python==4.8.1.78",
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        "pillow==9.5.0",
        "pip==23.3.1",
        "platformdirs==4.0.0",
        "protobuf==3.20.0",
        "psutil==5.9.5",
        "pyasn1-modules==0.3.0",
        "pyasn1==0.5.1",
        "pydantic==1.10.13",
        "pydub==0.25.1",
        "pyparsing==3.1.1",
        "pysocks==1.7.1",
        "python-dateutil==2.8.2",
        "python-multipart==0.0.6",
        "pytorch-lightning==1.9.4",
        "pytz==2023.3.post1",
        "pywavelets==1.5.0",
        "pyyaml==6.0.1",
        "realesrgan==0.3.0",
        "referencing==0.31.0",
        "regex==2023.10.3",
        "requests-oauthlib==1.3.1",
        "requests==2.31.0",
        "resize-right==0.0.2",
        "rpds-py==0.13.1",
        "rsa==4.9",
        "safetensors==0.3.1",
        "scikit-image==0.21.0",
        "scipy==1.11.4",
        "semantic-version==2.10.0",
        "sentencepiece==0.1.99",
        "setuptools==63.2.0",
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        "soupsieve==2.5",
        "starlette==0.26.1",
        "sympy==1.12",
        "tb-nightly==2.16.0a20231123",
        "tensorboard-data-server==0.7.2",
        "tf-keras-nightly==2.16.0.dev2023112310",
        "tifffile==2023.9.26",
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        "tomesd==0.1.3",
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        "torch==2.0.1+cu118",
        "torchdiffeq==0.2.3",
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        "torchvision==0.15.2+cu118",
        "tqdm==4.66.1",
        "trampoline==0.1.2",
        "transformers==4.30.2",
        "typing-extensions==4.8.0",
        "tzdata==2023.3",
        "urllib3==2.1.0",
        "uvicorn==0.24.0.post1",
        "wcwidth==0.2.12",
        "websockets==11.0.3",
        "werkzeug==3.0.1",
        "yapf==0.40.2",
        "yarl==1.9.3",
        "zipp==3.17.0"
    ]
}

### What browsers do you use to access the UI ?

Microsoft Edge

### Console logs

```Shell
venv "C:\stablediffusion\venv\Scripts\Python.exe"
Python 3.10.6 (tags/v3.10.6:9c7b4bd, Aug  1 2022, 21:53:49) [MSC v.1932 64 bit (AMD64)]
Version: v1.6.0-2-g4afaaf8a
Commit hash: 4afaaf8a020c1df457bcf7250cb1c7f609699fa7
Launching Web UI with arguments:
no module 'xformers'. Processing without...
no module 'xformers'. Processing without...
No module 'xformers'. Proceeding without it.
Loading weights [bc1260f896] from C:\stablediffusion\models\Stable-diffusion\Halcyon v13.safetensors
Running on local URL:  http://127.0.0.1:7860

To create a public link, set `share=True` in `launch()`.
Creating model from config: C:\stablediffusion\repositories\generative-models\configs\inference\sd_xl_base.yaml
Startup time: 7.5s (prepare environment: 1.5s, import torch: 2.3s, import gradio: 0.6s, setup paths: 0.6s, initialize shared: 0.2s, other imports: 0.4s, load scripts: 0.6s, create ui: 0.4s, gradio launch: 0.7s).
Applying attention optimization: Doggettx... done.
Model loaded in 7.5s (load weights from disk: 0.9s, create model: 0.5s, apply weights to model: 5.7s, calculate empty prompt: 0.2s).
Loading C:\stablediffusion\models\Stable-diffusion\lunaMia_v50bakedvae.safetensors...
Loading C:\stablediffusion\models\Stable-diffusion\cineroXLPhotomatic_v12aPHENO.safetensors...
Merging...
100%|█████████████████████████████████████████████████████████████████████████████| 2516/2516 [00:10<00:00, 244.82it/s]
Saving to C:\stablediffusion\models\Stable-diffusion\Halcyon merge A.safetensors...
*** Error loading/saving model file
    Traceback (most recent call last):
      File "C:\stablediffusion\modules\ui_checkpoint_merger.py", line 21, in modelmerger
        results = extras.run_modelmerger(*args)
      File "C:\stablediffusion\modules\extras.py", line 315, in run_modelmerger
        safetensors.torch.save_file(theta_0, output_modelname, metadata=metadata if len(metadata)>0 else None)
      File "C:\stablediffusion\venv\lib\site-packages\safetensors\torch.py", line 232, in save_file
        serialize_file(_flatten(tensors), filename, metadata=metadata)
    TypeError: argument 'metadata': 'dict' object cannot be converted to 'PyString'

---
```


### Additional information

I have deleted and reinstalled Automatic 1111 twice, and uninstalled and reinstalled Python. So far nothing has worked to fix it.