Fatal Error on New Post Creation, PHP 8.x

Current plugin: Genesis Blocks (version 1.5.3)
PHP version 8.1.12

Error Details
=============
An error of type E_ERROR was caused in line 197 of the file /www/wp-content/plugins/genesis-blocks/src/blocks/block-newsletter/includes/newsletter-functions.php. 

Error message: Uncaught TypeError: Cannot access offset of type string on string in /www/wp-content/plugins/genesis-blocks/src/blocks/block-newsletter/includes/newsletter-functions.php:197

Stack trace:
#0 /www/wp-content/plugins/genesis-blocks/src/blocks/block-newsletter/includes/newsletter-functions.php(257): Genesis\Blocks\Newsletter\mailing_list_providers()
#1 /wordpress/wp-includes/class-wp-hook.php(307): Genesis\Blocks\Newsletter\admin_assets('')
#2 /wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#3 /wordpress/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /wordpress/wp-admin/edit-form-blocks.php(270): do_action('enqueue_block_e...')
#5 /wordpress/wp-admin/post.php(187): require('/wordpress/wp-a...')
#6 {main}
  thrown