Fix claude v4

app.py

@@ -64,16 +64,24 @@ def chat_with_bot(message, history):
             do_sample=True,
             top_p=0.95,
         )
+        
+        if not response:
+            response = "I received an empty response. Please try again."
+            print("Warning: Empty response from LLM")
+        
+        response_str = str(response).strip()
 
         # Append to history
         history.append({"role": "user", "content": message})
-        history.append({"role": "assistant", "content": response})
+        history.append({"role": "assistant", "content": response_str})
 
-        return history, response
+        return history, response_str
 
     except Exception as e:
+        import traceback
         print(f"LLM Error: {e}")
-        error_msg = f"Error: {str(e)}"
+        print(f"Traceback: {traceback.format_exc()}")
+        error_msg = f"Error: {str(e) if str(e) else 'Unknown error occurred'}"
         history.append({"role": "user", "content": message})
         history.append({"role": "assistant", "content": error_msg})
         return history, error_msg