WOO COMMERCE EXPERTS ONLY PLZ .When customer checks out it stalls the website serevely

This is the error shown by woo commerce system manager. ### WordPress Environment ### Home URL: [login to view URL] Site URL: [login to view URL] WC Version: 3.4.5 Log Directory Writable: ✔ WP Version: 4.9.8 WP Multisite: – WP Memory Limit: 512 MB WP Debug Mode: – WP Cron: ✔ Language: en_US External object cache: – ### Server Environment ### Server Info: Apache PHP Version: 7.0.32-1+0~20181001133719.6+jessie~[login to view URL] - We recommend using PHP version 7.2 or above for greater performance and security. How to update your PHP version PHP Post Max Size: 128 MB PHP Time Limit: 600 PHP Max Input Vars: 5000 cURL Version: 7.38.0 OpenSSL/1.0.1t SUHOSIN Installed: – MySQL Version: 5.5.5-10.0.36-MariaDB-1~jessie Max Upload Size: 128 MB Default Timezone is UTC: ✔ fsockopen/cURL: ✔ SoapClient: ✔ DOMDocument: ✔ GZip: ✔ Multibyte String: ✔ Remote Post: ✔ Remote Get: ✔ ### Database ### WC Database Version: 3.4.5 WC Database Prefix: wp_ MaxMind GeoIP Database: ✔ Total Database Size: 304.91MB Database Data Size: 264.19MB Database Index Size: 40.72MB wp_woocommerce_sessions: Data: 76.05MB + Index: 1.02MB wp_woocommerce_api_keys: Data: 0.02MB + Index: 0.03MB wp_woocommerce_attribute_taxonomies: Data: 0.02MB + Index: 0.02MB wp_woocommerce_downloadable_product_permissions: Data: 0.02MB + Index: 0.05MB wp_woocommerce_order_items: Data: 0.28MB + Index: 0.09MB wp_woocommerce_order_itemmeta: Data: 2.52MB + Index: 3.02MB wp_woocommerce_tax_rates: Data: 0.02MB + Index: 0.06MB wp_woocommerce_tax_rate_locations: Data: 0.02MB + Index: 0.03MB wp_yith_wcwl: Data: 0.00MB + Index: 0.01MB wp_yith_wcwl_lists: Data: 0.02MB + Index: 0.04MB wp_yoast_seo_links: Data: 0.08MB + Index: 0.02MB wp_yoast_seo_meta: Data: 0.02MB + Index: 0.00MB member: 8 nav_menu_item: 156 oembed_cache: 1 page: 74 portfolio: 12 post: 5 product: 347 product_variation: 1710 revision: 4 shop_coupon: 63 shop_order: 2066 um_directory: 1 um_form: 3 wafs: 1 woo_discount: 1 wpcf7_contact_form: 6 wysijap: 1 ywdpd_discount: 1 ### Security ### Secure connection (HTTPS): ✔ Hide errors from visitors: ✔ p base: #207 - /shop/ Cart: #208 - /cart/ Checkout: #209 - /checkout/ My account: ❌ Page does not contain the shortcode. Terms and conditions: ❌ Page not set ### Theme ### Name: The7 Version: 6.9.3.1 Author URL: [login to view URL] Child Theme: ❌ – If you are modifying WooCommerce on a parent theme that you did not build personally we recommend using a child theme. See: How to create a child theme WooCommerce Support: ✔ ### Templates ### Overrides: dt-the7/woocommerce/cart/[login to view URL] dt-the7/woocommerce/cart/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/checkout/[login to view URL] dt-the7/woocommerce/[login to view URL] dt-the7/woocommerce/[login to view URL] dt-the7/woocommerce/global/[login to view URL] dt-the7/woocommerce/global/[login to view URL] dt-the7/woocommerce/global/[login to view URL] dt-the7/woocommerce/loop/[login to view URL] dt-the7/woocommerce/loop/[login to view URL] dt-the7/woocommerce/loop/[login to view URL] dt-the7/woocommerce/myaccount/[login to view URL] dt-the7/woocommerce/notices/[login to view URL] dt-the7/woocommerce/notices/[login to view URL] dt-the7/woocommerce/notices/[login to view URL] dt-the7/woocommerce/order/[login to view URL] dt-the7/woocommerce/order/[login to view URL] dt-the7/woocommerce/single-product/[login to view URL] dt-the7/woocommerce/single-product/[login to view URL] dt-the7/woocommerce/single-product/[login to view URL] dt-the7/woocommerce/single-product/[login to view URL] `