WHMCS errors on "createaccount" action

I was looking through my error logs and found that when "createaccount" is triggered I get the following error from WordPress

Array
(
[0] => <b>Warning</b>: fopen(/home/account/public_html/wp-content/plugins/EMPTY): failed to open stream: No such file or directory in <b>/home/account/public_html/wp-includes/functions.php</b> on line <b>3879</b>

<b>Warning</b>: fread() expects parameter 1 to be resource, boolean given in <b>/home/account/public_html/wp-includes/functions.php</b> on line <b>3882</b>

<b>Warning</b>: fclose() expects parameter 1 to be resource, boolean given in <b>/home/account/public_html/wp-includes/functions.php</b> on line <b>3885</b>

Everything seems to working because it does create the site on WP but the response sent to WHMCS has that error.
The following plugins are active on the network:
Dommain Mapping
Google Analytics+
New Blog Templaes
Pretty plugins
Ultimate Branding
WHMCS Multisite Provisioning
WPMU DEV Dashboard

Global WP
Gravity Forms
WHMCS WordPress Integration
WordPress HTTPS

Is there a way to fix this?