shopping cart quick add

snippets/shx-product-page-shopping-cart-quick-add.liquid

@@ -23,10 +23,12 @@
 
 <script>
   document.addEventListener('scroll', function() {
-    var scrollButton = document.getElementsByTagName('scroll-to-cart-button')[0];
+    var scrollButton = document.getElementsByClassName('scroll-to-cart-button')[0];
     
     console.log("scrollButton", scrollButton)
 
+    if (scrollButton === undefined) return
+
     if (window.scrollY > 300) { // Zeigt den Button an, wenn mehr als 300px gescrollt wird
       scrollButton.style.display = 'block';
     } else {