Site Error Log showing Membership errors aplenty

Greetings,

Ever since updating to WP 3.4, we’ve been experiencing lots of random Server Error (Code 500) messages on random things. Updating blog posts, editing theme files via the editor, as well as several others.

I’ve been checking through the error logs on the root of our installation, and one message is see repeated HUNDREDS of times is this:

[02-Jul-2012 17:37:55 UTC] PHP Warning: strstr() [function.strstr]: Empty delimiter in /home/*REDACTED*/public_html/wp-content/plugins/membership/membershipincludes/classes/membershippublic.php on line 422

Any idea what may be going on here, and if it could be the cause of a larger issue?