Fatal error: Uncaught Error: Call to a member function get_id() on bool in

Hi,
Whenever I try to put a product in my cart i get the fatal error below. I can’t explain why this error popped-up. Does someone know how to fix this?

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Fatal error: Uncaught Error: Call to a member function get_id() on bool in /home/XXXX/public_html/wp-content/plugins/gourl-woocommerce-bitcoin-altcoin-payment-gateway-addon/gourl-woocommerce.php:263 Stack trace: #0 /home/XXXX/public_html/wp-includes/class-wp-hook.php(324): gourl_wc_remove_trial(Object(WC_Cart)) #1 /home/XXXX/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(Object(WC_Cart), Array) #2 /home/XXXX/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /home/XXXX/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php(1406): do_action(‘woocommerce_bef…’, Object(WC_Cart)) #4 /home/XXXX/public_html/wp-includes/class-wp-hook.php(322): WC_Cart->calculate_totals() #5 /home/XXXX/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #6 /home/XXXX/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #7 /home/XXXX/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php(1286) in /home/XXXX/public_html/wp-content/plugins/gourl-woocommerce-bitcoin-altcoin-payment-gateway-addon/gourl-woocommerce.php on line 263