Problem after upgrading to 3.0.1 on WP 5.5.1

I’ve updated plugin to 3.0.1 version but found some problems.

Unable to add new post – edit dialog is crashed and there are a lot of warnings in logs:

PHP Warning: in_array() expects parameter 2 to be array, null given in
/wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php on line 2623

PHP Warning: Cannot modify header information – headers already sent by (output started at /wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php:2745) in /wp-admin/admin-header.php on line 9

PHP Warning: in_array() expects parameter 2 to be array, string given in
/wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php on line 2745, referer: https://www.site.com/wp-admin/post-new.php

PHP Warning: Cannot modify header information – headers already sent by (output started at /wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php:2745) in /wp-admin/post.php on line 231, referer: https://www.site.com/wp-admin/post-new.php?wp-post-new-reload=true&wp-post-new-reload=true

PHP Warning: Cannot modify header information – headers already sent by (output started at /home/e-vesti/e-vesti.ru/docs/wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php:2745) in /wp-includes/pluggable.php on line 1296, referer: https://www.site.com/wp-admin/post-new.php?wp-post-new-reload=true&wp-post-new-reload=true

PHP Warning: in_array() expects parameter 2 to be array, null given in /wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php on line 2623, referer: https://www.site.com/wp-admin/edit.php

PHP Warning: Cannot modify header information – headers already sent by (output started at /wp-content/plugins/push-notification-for-wp-by-pushassist/admin/class-pushassist-admin.php:2623) in /wp-admin/admin-header.php on line 9, referer: https://www.site.com/wp-admin/edit.php