On local server we work on pho 7.10. And the WP setup is:
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', true );
@ini_set( 'display_errors', 1 );
I don’t really know how to solve your problem, because we don’t have it. The error might happen when it’s combined with other admin or colour changing plugins or something.