Form stuck on sending

It seems our form is getting stuck on the sending part. With the plugin turned off, everything works. Plugin turned on, stuck on sending.

Tested in php 8.1 and 8.2.
Everything is updated.

Any ideas?

Error log:

[18-Jan-2024 11:53:28 UTC] PHP Fatal error: Uncaught TypeError: copy(): Argument #1 ($from) must be of type string, array given in /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/save-contact-form-7/save-contact-form-7.php:941
Stack trace: 0 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/save-contact-form-7/save-contact-form-7.php(941): copy(Array, ‘/var/www/vhosts…’) 1 /var/www/vhosts/domain.nl/httpdocs/wp-includes/class-wp-hook.php(326): nimble_save_cf7_data(Object(WPCF7_ContactForm)) 2 /var/www/vhosts/domain.nl/httpdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) 3 /var/www/vhosts/domain.nl/httpdocs/wp-includes/plugin.php(565): WP_Hook->do_action(Array) 4 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/submission.php(776): do_action_ref_array(‘wpcf7_before_se…’, Array) 5 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/submission.php(111): WPCF7_Submission->before_send_mail() 6 [internal function]: WPCF7_Submission->{closure}() 7 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/l10n.php(147): call_user_func(Object(Closure)) 8 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/submission.php(137): wpcf7_switch_locale(‘nl_NL’, Object(Closure)) 9 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/submission.php(35): WPCF7_Submission->proceed() 10 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/contact-form.php(1062): WPCF7_Submission::get_instance(Object(WPCF7_ContactForm), Array) 11 /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/contact-form-7/includes/rest-api.php(358): WPCF7_ContactForm->submit() 12 /var/www/vhosts/domain.nl/httpdocs/wp-includes/rest-api/class-wp-rest-server.php(1193): WPCF7_REST_Controller->create_feedback(Object(WP_REST_Request)) 13 /var/www/vhosts/domain.nl/httpdocs/wp-includes/rest-api/class-wp-rest-server.php(1041): WP_REST_Server->respond_to_request(Object(WP_REST_Request), ‘/contact-form-7…’, Array, NULL) 14 /var/www/vhosts/domain.nl/httpdocs/wp-includes/rest-api/class-wp-rest-server.php(431): WP_REST_Server->dispatch(Object(WP_REST_Request)) 15 /var/www/vhosts/domain.nl/httpdocs/wp-includes/rest-api.php(424): WP_REST_Server->serve_request(‘/contact-form-7…’) 16 /var/www/vhosts/domain.nl/httpdocs/wp-includes/class-wp-hook.php(324): rest_api_loaded(Object(WP)) 17 /var/www/vhosts/domain.nl/httpdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array) 18 /var/www/vhosts/domain.nl/httpdocs/wp-includes/plugin.php(565): WP_Hook->do_action(Array) 19 /var/www/vhosts/domain.nl/httpdocs/wp-includes/class-wp.php(418): do_action_ref_array(‘parse_request’, Array) 20 /var/www/vhosts/domain.nl/httpdocs/wp-includes/class-wp.php(813): WP->parse_request(”) 21 /var/www/vhosts/domain.nl/httpdocs/wp-includes/functions.php(1336): WP->main(”) 22 /var/www/vhosts/domain.nl/httpdocs/wp-blog-header.php(16): wp() 23 /var/www/vhosts/domain.nl/httpdocs/index.php(17): require(‘/var/www/vhosts…’) 24 {main}
thrown in /var/www/vhosts/domain.nl/httpdocs/wp-content/plugins/save-contact-form-7/save-contact-form-7.php on line 941