Update templates/cart.html

templates/cart.html

@@ -179,6 +179,11 @@
             } else if (action === 'decrease' && quantity > 1) {
                 quantity--;
             }
+            if (isNaN(quantity) || quantity < 1) {
+                console.error("Invalid quantity:", quantity);
+                alert("Quantity must be a valid number greater than 0.");
+                return;
+        }
             console.log({
                 email: customerEmail,
                 item_name: itemName,