Plugin causing issue on admin-ajax.php

To further describe the issue, I have attached here the exact server error log: https://tppr.me/CCnth

Have error 500 if in cart have more products if have one is okay.
Fix IT with this!

<script type="text/javascript">

              
                    $("form.checkout").on("change", "input.qty", function () {

                        $.ajax({
                            url: '\/wp-admin\/admin-ajax.php',
                            data: {
                                action: 'cqoc_update_order_review',
                                security: wc_checkout_params.update_order_review_nonce,
                                post_data: $('form.checkout').serialize()
                            },
                            type: 'post',
                            success: function (response) {
                                console.log(response);
                                $('body').trigger('update_checkout');
                            }
                        });

                    });
                </script>

function cqoc_update_order_review() {

            $values = array();
            parse_str($_POST['post_data'], $values);
            $cart = $values['cart'];
            print_r($cart);
            $cart_updated = false;
            foreach ($cart as $cart_item_key => $cart_value) {
                $passed_validation = apply_filters('woocommerce_update_cart_validation', true, $cart_item_key, $values, $quantity);
                if ($passed_validation) {
                    WC()->cart->set_quantity($cart_item_key, $cart_value['qty'], false);
                    $cart_updated = true;
                }

                //  woocommerce_cart_totals();
            }
            // Trigger action - let 3rd parties update the cart if they need to and update the $cart_updated variable.
            $cart_updated = apply_filters('woocommerce_update_cart_action_cart_updated', $cart_updated);

            if ($cart_updated) {
                WC()->cart->calculate_totals();
            }
            exit;
        }

I’m glad to know that you are able to fix the issue & sharing the solution.

I have many users who have multiple products in the cart and it works without any issues.

I have also checked with multiple products in the cart and it works.

Of course , may be i have many Plugins or many change in function,just this is my solution for my problem.
Best regards!

The issue is solved hence marking it as resolved.