Update app.py

app.py

@@ -77,7 +77,7 @@ async def niji_api(prompt, progress=gr.Progress(), max_retries=5, backoff_factor
             images = split_image(img)
             return [save_image(i) for i in images]
         except Exception:
-            return [None]*4
+            pass
 
     while prog < 100:
         try: