Update app.py

app.py

@@ -129,23 +129,25 @@ def render_message(history):
 
 js = """
 function Scrolldown() {
-    
     const messagesContainer = document.getElementById('messages');
-
+    if (!messagesContainer) {
+        console.error('Messages container not found!');
+        return;
+    }
     const observer = new MutationObserver((mutationsList, observer) => {
         for (const mutation of mutationsList) {
             if (mutation.type === 'childList') {
                 const chatboxContainer = document.getElementById('chatbox-container');
-                chatboxContainer.scrollTop = chatboxContainer.scrollHeight; 
+                if (chatboxContainer) {
+                    chatboxContainer.scrollTop = chatboxContainer.scrollHeight; 
+                }
             }
         }
     });
-
     const config = { childList: true }; 
-
     observer.observe(messagesContainer, config);
-    console.log('Observing')
-}
+    console.log('Observing');
+ }
 """