Invalid Argument posts.php

I tried WP Better Security and it didn’t work out. Since uninstalling it, I’ve gotten this warning:

Warning: Invalid argument supplied for foreach() in /*/*/*/wp-includes/post.php on line 3588

Looking at post.php on line 3588, this is the code, the $inclusions is line 3588, there’s a blank line after that and the ‘if’ is line 3587:

if (!empty($inclusions))
		$inclusions .= ')';

I’m not sure how to fix it. I’ve reinstalled WP 3.5 and it did not help. I’m clueless, of course.