missing argument & fatal error – mailchimp extention

Hey,
After installing and configuring Contact Form 7 MailChimp Extension, I just get spinning arrows below the submit button, and the following errors in my logs.

[04-Mar-2019 00:37:41 UTC] PHP Warning:  Missing argument 3 for Cf7_Grid_Layout_Public::filter_table_tab_mail_tag() in *path*/wp-content/plugins/cf7-grid-layout/public/class-cf7-grid-layout-public.php on line 1378
[04-Mar-2019 00:37:41 UTC] PHP Warning:  Missing argument 4 for Cf7_Grid_Layout_Public::filter_table_tab_mail_tag() in *path*/wp-content/plugins/cf7-grid-layout/public/class-cf7-grid-layout-public.php on line 1378
[04-Mar-2019 00:37:41 UTC] PHP Fatal error:  Call to a member function field_name() on null in *path*/wp-content/plugins/cf7-grid-layout/public/class-cf7-grid-layout-public.php on line 1380

I’m not using tables or tabs in this form, and I have no filters in functions.php

Thanks in advance!

Andrew