client denied by server configuration

Hello,

Getting a bunch of these (every few seconds) in error log:
[Sat Feb 11 14:57:45.836494 2017] [access_compat:error] [pid 21313] [client 1234.56.78.99:58797] AH01797: client denied by server configuration: /var/www/clients/client2/web34/web/wp-content/plugins/wordpress-chat/wpmudev-chat-ajax.php, referer: https://site.com/wp-admin/network/

Chat won't work in multisites because Defender places htaccess in wp-content:

## WP Defender - Prevent PHP Execution ##
<Files *.php>
Order allow,deny
Deny from all
</Files>
## WP Defender - End ##

Is there a work around besides removing htaccess?

Thanks