Error creating multi site.

Error creating multi site.

I'm having trouble creating new multisites, the message that is displayed is:

Notice: Undefined offset: 0 in /home/webfox33com12br4/public_html/wp-content/plugins/wp-defender/app/module/audit/event-abstract.php on line 94

Warning: Can not modify header information - in / home / Webfox33com12br4 / public_html / wp-includes / pluggable.php on line 1210

See attached.