CRITICAL Uncaught Error

2023-06-29T17:14:16+00:00 CRITICAL Uncaught Error: Call to a member function get_code() on null in /usr/share/nginx/wordpress/wp-content/plugins/discount-and-dynamic-pricing/public/class-thwdpf-public-discount-cart.php:137

Stack trace:

#0 /usr/share/nginx/wordpress/wp-includes/class-wp-hook.php(308): THWDPF_Public_Discount_Cart->remove_coupon_errors()

#1 /usr/share/nginx/wordpress/wp-includes/plugin.php(205): WP_Hook->apply_filters()

#2 /usr/share/nginx/wordpress/wp-content/plugins/woocommerce/includes/class-wc-coupon.php(1098): apply_filters()

#3 /usr/share/nginx/wordpress/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(251): WC_Coupon::get_generic_coupon_error()

#4 /usr/share/nginx/wordpress/wp-includes/class-wp-hook.php(308): WC_AJAX::apply_coupon()

#5 /usr/share/nginx/wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()

#6 /usr/share/nginx/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action()

#7 /usr/share/nginx/wordpress/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(96): do_action()

#8 /usr/share/nginx/wordpress/wp-includes/class-wp-hook.php(308): WC_AJAX::do_wc_ajax()

#9 /usr/share/nginx/wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()

#10 /usr/share/nginx/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action()

#11 /usr/share/nginx/wordpress/wp-includes/template-loader.php(13): do_action()

#12 /usr/share/nginx/wordpress/wp-blog-header.php(19): require_once('...')

#13 /usr/share/nginx/wordpress/index.php(17): require('...')

#14 {main}

  thrown in /usr/share/nginx/wordpress/wp-content/plugins/discount-and-dynamic-pricing/public/class-thwdpf-public-discount-cart.php on line 137