Hello @niklasinpsyde
I was using 7.0.1 and I just updated to 7.0.2. After that, the problem seems to be gone.
If this can help you, find the log below:
An error of type E_ERROR was caused at the line 48 of the file /home/private/website.com/wp-content/plugins/mollie-payments-for-woocommerce/src/SDK/Api.php. Error message: Uncaught TypeError: preg_match() expects parameter 2 to be string, bool given in /home/private/website.com/wp-content/plugins/mollie-payments-for-woocommerce/src/SDK/Api.php:48
Stack trace:
#0 /home/private/website.com/wp-content/plugins/mollie-payments-for-woocommerce/src/SDK/Api.php(48): preg_match('#^(live|test)_\\...', true)
#1 /home/private/website.com/wp-content/plugins/mollie-payments-for-woocommerce/src/Payment/PaymentModule.php(406): Mollie\WooCommerce\SDK\Api->getApiClient(true)
#2 /home/private/website.com/wp-includes/class-wp-hook.php(309): Mollie\WooCommerce\Payment\PaymentModule->cancelOrderAtMollie(980)
#3 /home/private/website.com/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#4 /home/private/website.com/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /home/private/website.com/wp-content/plugins/woocommerce/includes/class-wc-order.php(364): do_action('woocommerce_ord...', 980, Object(Automattic\WooCommerce\Admin\Overrides\O
(Some parts were in my langage, I translated them in English)
You can mark the thread as resolved.
Best regards,
Oshika