Fatal Error if no or not existing Order-Key

[Snickbrack]

Fatal error: Uncaught Error: Call to a member function get_payment_method() on boolean in wp-content/plugins/woocommerce-heidelpay-1.3.0/includes/abstracts/abstract-wc-heidelpay-payment-gateway.php:486
Stack trace:

#0 /wp-includes/class-wp-hook.php(288): WC_Heidelpay_Payment_Gateway->addPayInfo('Vielen Dank. De...')
#1 /wp-includes/plugin.php(203): WP_Hook->apply_filters('Vielen Dank. De...', Array)
#2 /wp-content/plugins/woocommerce/templates/checkout/thankyou.php(83): apply_filters('woocommerce_tha...', 'Vielen Dank. De...', NULL)
#3 /wp-content/plugins/woocommerce/includes/wc-core-functions.php(208): include('/var/www/vhosts...')
#4 /wp-content/plugins/woocommerce/includes/shortcodes/class-wc-shortcode-checkout.php(241): wc_get_template('checkout/thanky...', Array) in /woocommerce-heidelpay-1.3.0/includes/abstracts/abstract-wc-heidelpay-payment-gateway.php on line 486

[Snickbrack]

Will this issue ever be resolved?