Update app.py

app.py

@@ -287,11 +287,17 @@ button {
 """
 scroll_to_top_js = """
 <script>
+    // Function to scroll to the top of the page when navigating
+    function scrollToTop() {
+        window.scrollTo({ top: 0, behavior: "smooth" });
+    }
+    
+    // Attach scroll-to-top functionality to buttons dynamically
     document.addEventListener('DOMContentLoaded', function () {
-        const cartButton = document.querySelector('button[gr-id="view_cart_button"]');
-        cartButton.addEventListener('click', () => {
-            window.scrollTo({ top: 0, behavior: "smooth" });
-        });
+        const viewCartButton = document.querySelector('button[gr-id="view_cart_button"]');
+        if (viewCartButton) {
+            viewCartButton.addEventListener('click', scrollToTop);
+        }
     });
 </script>
 """