Update app.py

app.py

@@ -11,10 +11,13 @@ audio_gen = gr.Blocks.load(name="spaces/fffiloni/audioldm-text-to-audio-generati
 ph_message="If you're not happy with sound result, you can manually describe the scene depicted in your image :)"
 
 def input_changes(input_img):
-    cap = caption(input_img, fn_index=0)
-    print("gpt2 caption: '" + cap + "' • ")
-    ph_update = "gpt2 caption: '" + cap + "' • "
-    return manual_cap.update(value="",placeholder=f"{ph_update}{ph_message}"), caption_output.update(value=cap), sound_output.update(value=None)
+    if input_img == None:
+        pass
+    else:
+        cap = caption(input_img, fn_index=0)
+        print("gpt2 caption: '" + cap + "' • ")
+        ph_update = "gpt2 caption: '" + cap + "' • "
+        return manual_cap.update(value="",placeholder=f"{ph_update}{ph_message}"), caption_output.update(value=cap), sound_output.update(value=None)
 
 def input_clear():
     return manual_cap.update(value="",placeholder=ph_message), caption_output.update(value=None), sound_output.update(value=None)