Getting image_flag error

app_dialogue.py

@@ -257,8 +257,10 @@ def flag_dope(
         if isinstance(ex[0], dict):
             images.append(ex[0]["file"])
             prev_ex_is_image = True
-
-    image_flag = images[0]
+    if len(images) > 0:
+        image_flag = images[0]
+    else:
+        image_flag = False
     dope_dataset_writer.flag(
         flag_data=[
             model_selector,