Buddypress Docs - warning message

I've searched around the net for a solution to this, but I can't find one. I have Boone Gorges' Buddypress Docs plugin installed on our site and whilst it's a bit ugly and clunky it does the job.

Since updating Buddypress, Membership, Docs and Wordpress I now get a whole bunch of error messages on my docs pages that read something like this:

Warning: stripos() [function.stripos]: needle is not a string or an integer in /var/sites/m/mydomain.co.uk/public_html/wp-includes/functions.php on line 658

Any ideas how to fix this or an alternative plugin I could use within Buddypress to share how to guides and videos within the groups?