Conflict between latest version WooCommerce Bookings and Mollie

Hello team,

There seems to be a conflict between latest version WooCommerce Bookings and Mollie.
After updating to 1.15.31, the checkout page gives 500 errors, the checkout button is gone on the cartpage and the WooCommerce settings are unreachable.
After restoring a backup of WooCommerce Booking (1.15.24) all works good.

2020-12-04T09:07:18+00:00 CRITICAL Uncaught Error: Undefined class constant ‘VERSION’ in /home/clientname/domains/website637126318768.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/vendor/mollie/mollie-api-php/src/MollieApiClient.php:287
Stack trace:
#0 /home/clientname/domains/website637126318768.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/src/Mollie/WC/Helper/Api.php(45): Mollie\Api\MollieApiClient->__construct()
#1 /home/clientname/domains/website637126318768.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/src/Mollie/WC/Helper/Data.php(341): Mollie_WC_Helper_Api->getApiClient(false)
#2 /home/clientname/domains/website637126318768.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/inc/utils.php(116): Mollie_WC_Helper_Data->getApiPaymentMethods(false, true)
#3 /home/clientname/domains/website637126318768.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/src/Mollie/WC/Gateway/Abstract.php(2100): mollieWooCommerceAvailablePaymentMethods()
#4 /hom in /home/clientname/domains/website637126318768.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/vendor/mollie/mollie-api-php/src/MollieApiClient.php op de lijn 287

How can I solve this?

Best regards,
Tom