WooCommerce: Custom function adding free product - Cart page getting broken for orders up to 3000

WooCommerce Cart Page breaks as soon as I add a product to cart If the value of the cart goes above 3000. Below is the code I am using in functions.php of my theme: add_action('woocommerce_check_cart_items', 'qualifies_for_incentive' ); // Cart's Total Excluding Taxes function qualifies_for_incentive() { // Incentive product we are giving away $incentive_product_id = 6971; if( qualifies_basedon_cart_total( 250 ) ) { add_incentive_to_cart( $incentive_product_id ); } else { remove_incentive_from_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 1000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 1250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 1500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 1750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 2000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 2250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 2500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 2750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 3000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 3250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 3500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 3750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 4000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 4250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 4500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 4750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 5000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 5250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 5500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 5750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 6000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 6250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 6500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 6750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 7000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 7250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 7500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 8000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 8250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 8500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 8750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 9000 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 9250 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 9500 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 9750 ) ) { add_incentive_to_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 10000 ) ) { add_incentive_to_cart( $incentive_product_id ); } } /** * Adds a specific product to the cart * @param $product_id Product to be added to the cart */ function add_incentive_to_cart( $product_id ) { // Check the cart for this product $cart_id = WC()->cart->generate_cart_id( $product_id ); $prod_in_cart = WC()->cart->find_product_in_cart( $cart_id ); // Add the product only if it's not in the cart already if( qualifies_basedon_cart_total( 250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,1 ); } else { remove_incentive_from_cart( $incentive_product_id ); } if( qualifies_basedon_cart_total( 500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,2 ); } if( qualifies_basedon_cart_total( 750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,3 ); } if( qualifies_basedon_cart_total( 1000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,4 ); } if( qualifies_basedon_cart_total( 1250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,5 ); } if( qualifies_basedon_cart_total( 1500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,6 ); } if( qualifies_basedon_cart_total( 1750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,7 ); } if( qualifies_basedon_cart_total( 2000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,8 ); } if( qualifies_basedon_cart_total( 2250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,9 ); } if( qualifies_basedon_cart_total( 2500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,10 ); } if( qualifies_basedon_cart_total( 2750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,11 ); } if( qualifies_basedon_cart_total( 3000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id, 12); } if( qualifies_basedon_cart_total( 3250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,13 ); } if( qualifies_basedon_cart_total( 3500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,14 ); } if( qualifies_basedon_cart_total( 3750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,15 ); } if( qualifies_basedon_cart_total( 4000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,16 ); } if( qualifies_basedon_cart_total( 4250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,17 ); } if( qualifies_basedon_cart_total( 4500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,18 ); } if( qualifies_basedon_cart_total( 4750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,19 ); } if( qualifies_basedon_cart_total( 5000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,20 ); } if( qualifies_basedon_cart_total( 5250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,21 ); } if( qualifies_basedon_cart_total( 5500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,22 ); } if( qualifies_basedon_cart_total( 5750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,23 ); } if( qualifies_basedon_cart_total( 6000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,24 ); } if( qualifies_basedon_cart_total( 6250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,25 ); } if( qualifies_basedon_cart_total( 6500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,26 ); } if( qualifies_basedon_cart_total( 6750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,27 ); } if( qualifies_basedon_cart_total( 7000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,28 ); } if( qualifies_basedon_cart_total( 7250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,29 ); } if( qualifies_basedon_cart_total( 7500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,30 ); } if( qualifies_basedon_cart_total( 7750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,31 ); } if( qualifies_basedon_cart_total( 8000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,32 ); } if( qualifies_basedon_cart_total( 8250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,33 ); } if( qualifies_basedon_cart_total( 8500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,34 ); } if( qualifies_basedon_cart_total( 8750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,35 ); } if( qualifies_basedon_cart_total( 9000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,36 ); } if( qualifies_basedon_cart_total( 9250 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,37 ); } if( qualifies_basedon_cart_total( 9500 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,38 ); } if( qualifies_basedon_cart_total( 9750 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,39 ); } if( qualifies_basedon_cart_total( 10000 ) ) { WC()->cart->remove_cart_item( $prod_in_cart ); WC()->cart->add_to_cart( $product_id,40 ); } } /** * Removes a specific product from the cart * @param $product_id Product ID to be removed from the cart */ function remove_incentive_from_cart( $product_id ) { $prod_unique_id = WC()->cart->generate_cart_id( $product_id ); // Remove it from the cart by un-setting it unset( WC()->cart->cart_contents[$prod_unique_id] ); } /** * Checks the cart for the Total excluding taxes * @param $total_required * @return bool */ function qualifies_basedon_cart_total( $total_required ) { /* * We only want to run this on the cart or checkout page */ if( is_cart() || is_checkout () ) { if( WC()->cart->subtotal >= $total_required ) { return true; } } // Return false in case anything fails //return false; } Website: http://qa.fastandup.in Please I need help about this issue. What I am doing wrong? Thanks. Reference: WooCommerce Actions and Filters to Manipulate the Cart