Update app.py

app.py

@@ -116,7 +116,13 @@ def _launch_demo(args, model, tokenizer):
             query = {'text': chat_query}
         history_cp = copy.deepcopy(task_history)
         full_response = ""
-        history = process_history_for_model(history_cp)
+        processed_history = []
+        for item in task_history:
+            if isinstance(item, tuple) and len(item) == 2:
+                processed_history.append(item)
+            else:
+                print("Invalid history item:", item) 
+        history = process_history_for_model(processed_history)
         response, history = model.chat(tokenizer, query=query, history=history)
         image = tokenizer.draw_bbox_on_latest_picture(response, history)
         if image is not None: