Update app.py

app.py

@@ -63,7 +63,9 @@ def add_text(history, text, state):
     """
     if "history" not in state:
         state["history"] = []  # Initialize session-specific state
-    
+    if history is None or len(history) == 0:
+    history = []  # Initialize empty history list
+
     history = history + [(text, None)]
     yield history, ""
 
@@ -106,11 +108,13 @@ def main():
                         examples_per_page=3,
                     )
 
-            user_txt.submit(check_input_text, user_txt, None).success(add_text, [chatbot, user_txt, session_state], [chatbot, user_txt]).then(bot_kadi, [chatbot, session_state], [chatbot])
-            submit_btn.click(check_input_text, user_txt, None).success(add_text, [chatbot, user_txt, session_state], [chatbot, user_txt]).then(bot_kadi, [chatbot, session_state], [chatbot])
+            user_txt.submit(check_input_text, user_txt, None)
+            .success(add_text, [chatbot, user_txt, session_state], [chatbot, user_txt])
+            .then(bot_kadi, [chatbot, session_state], [chatbot])
+            submit_btn.click(check_input_text, user_txt, None)
+            .success(add_text, [chatbot, user_txt, session_state], [chatbot, user_txt])
+            .then(bot_kadi, [chatbot, session_state], [chatbot])
             clear_btn.click(lambda: None, None, chatbot, queue=False)
-
-
     demo.launch()
 
 if __name__ == "__main__":