fatal error after downgrading wp5.2->5.1.1

Fatal error: Uncaught Error: Call to undefined function get_current_screen() in /home/tomwible/public_html/wp-content/plugins/media-sync/media-sync.php:156 Stack trace: #0 /home/tomwible/public_html/wp-includes/class-wp-hook.php(286): media_sync_missing_media_library_apply_filter(Object(WP_Query)) #1 /home/tomwible/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array) #2 /home/tomwible/public_html/wp-includes/plugin.php(531): WP_Hook->do_action(Array) #3 /home/tomwible/public_html/wp-includes/class-wp-query.php(1736): do_action_ref_array(‘pre_get_posts’, Array) #4 /home/tomwible/public_html/wp-includes/class-wp-query.php(3387): WP_Query->get_posts() #5 /home/tomwible/public_html/wp-includes/class-wp.php(622): WP_Query->query(Array) #6 /home/tomwible/public_html/wp-includes/class-wp.php(739): WP->query_posts() #7 /home/tomwible/public_html/wp-includes/functions.php(1105): WP->main(”) #8 /home/tomwible/public_html/wp-blog-header.php(16): wp() #9 /home/tomwible/public_html/index.php(17): require( in /home/tomwible/public_html/wp-content/plugins/media-sync/media-sync.php on line 156