Error: Warning: Creating default object from empty value

This probably means that your host has upgraded the server to php 5.4.x. Please reference this page on how to solve the issue: PHP 5.4: disable warning "Creating default object from empty value"

In summary, You either need have your own error handler or if this is the only place that it occurs then you just need to make it a stdClass before making it an array like so:

} // End IF Statement
$query_context = new stdClass();               
$query_context->context = array();

It is also possible that upgrading wordpress and its plugins would solve the problem. I don't know much about that area though...

Insert this at the beginning of whitelight/functions/admin-hooks.php to disable warnings:

error_reporting(E_ERROR);