Hi

Can anyone give me any help with this, please?
I've just got a 'Your Site is Experiencing a Technical Issue' email;

Error Details
=============
An error of type E_ERROR was caused in line 1528 of the file /home/u821715260/domains/vital50plus.com/public_html/wp-content/plugins/wpforo/includes/hooks.php. Error message: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /home/u821715260/domains/vital50plus.com/public_html/wp-content/plugins/wpforo/includes/hooks.php:1528
Stack trace:
#0 /home/u821715260/domains/vital50plus.com/public_html/wp-content/plugins/wpforo/includes/hooks.php(1528): in_array()
#1 /home/u821715260/domains/vital50plus.com/public_html/wp-includes/class-wp-hook.php(324): wpforo_userform_to_wpuser_html_form()
#2 /home/u821715260/domains/vital50plus.com/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#3 /home/u821715260/domains/vital50plus.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#4 /home/u821715260/domains/vital50plus.com/public_html/wp-admin/user-edit.php(884): do_action()
#5 {main}
  thrown