Update app.py

app.py

@@ -84,6 +84,7 @@ async def infer(model_str, prompt, nprompt="", height=0, width=0, steps=0, cfg=0
     if task.done() and result is not None and not isinstance(result, tuple):
         with lock:
             # png_path = "img.png"
+            global loopcounter 
             png_path = get_current_time() + "_" + loopcounter + ".png"
             loopcounter += 1
             image = save_image(result, png_path, model_str, prompt, nprompt, height, width, steps, cfg, seed)