wpdario

Got following error on screen trying to wp-admin the site. I was able to admin the site some months ago without problems. Probable cause is some automatic wordpress update to 6.0.3. but I am not the site owner.

Fatal error: Uncaught Error: Call to undefined function wp_get_current_user() in /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/capabilities.php:693 Stack trace: #0 /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-content/plugins/groups/lib/access/class-groups-post-access.php(232): current_user_can(‘groups_admin_gr…’) #1 /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/class-wp-hook.php(307): Groups_Post_Access::posts_where(‘ AND dpge_posts…’, Object(WP_Query)) #2 /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/plugin.php(235): WP_Hook->apply_filters(‘ AND dpge_posts…’, Array) #3 /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/class-wp-query.php(2653): apply_filters_ref_array(‘posts_where’, Array) #4 /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/class-wp-query.php(3613): WP_Query->get_posts() #5 /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/post.php(2410): WP_Query->query(Array) #6 /home/clients/bf6d4b9a256cfc32 in /home/clients/bf6d4b9a256cfc32f6dd5832e4f280f3/dpge/wp-includes/capabilities.php on line 693

The error does prohibit to admin the site. Backend impossible. The function causing the error on line 393 is checking current user capability to admin the site using the Groups plugin function : current_user_can(‘groups_admin_gr…’) since renaming the plugin through ftp from outside enables to admin the site.

Hereby the 2 source lines #692 and #693 involved from capabilites.php :

function current_user_can( $capability, …$args ) {
return user_can( wp_get_current_user(), $capability, …$args );

I tried to update the plugin but it did not change, throwing same error. Please help. Why is the wp_get_current_user() undefined at the moment ?