I’m getting the same issues with the header since upgrading this morning (Version 5.0.12 ).
Warning: Cannot modify header information - headers already sent by (output started at /home/efadmin/public_html/dev/wp-content/plugins/wp-live-chat-support/wp-live-chat-support.php:1) in /home/efadmin/public_html/dev/wp-includes/pluggable.php on line 1228
I have to deactivate the plugin so that I can access my dashboard.
