Update app.py

app.py

@@ -251,6 +251,8 @@ class ChatbotAPP:
         #message3 = load_model()
         self.unique_id = self.generate_unique_id()
         self.update_chatlog_name()
+        self.start_time = None
+        self.isFirstRun = True
         return f"All Chat components have been rest.  Uniqe ID for this session is, {self.unique_id}. Please note this down.",self.unique_id
 
     def clear_chat_window(self):