Running PHP 7
After last update (1.2.201606241):
Notice: Undefined index: HTTP_REFERER in /.../wp-content/plugins/wp-referrer-spam-blacklist/wpReferralBlackList.php on line 86
Warning: Cannot modify header information - headers already sent by (output started at /.../wp-content/plugins/wp-referrer-spam-blacklist/wpReferralBlackList.php:86) in /.../wp-includes/pluggable.php on line 1167
Running PHP 7 After last update (1.2.201606241): Notice: Undefined index: HTTP_REFERER in /.../wp-content/plugins/wp-referrer-spam-blacklist/wpReferralBlackList.php on line 86
Warning: Cannot modify header information - headers already sent by (output started at /.../wp-content/plugins/wp-referrer-spam-blacklist/wpReferralBlackList.php:86) in /.../wp-includes/pluggable.php on line 1167
via https://wordpress.org/support/topic/whitescreen-front-and-backend-version?replies=3#post-8602557