PHP error when trying to add a document, using a taxonomy-based folder structure

I created a files section.
I created a vocabulary and a taxonomy-based folder structure in it.
I added a reference to a term to the "document page" content type, then selected the newly created vocabulary.

Then when I open the page to create a new document, sometimes ive got an error sayaing

in_array is waiting for parameter 2 to be an array, but got a bollean instead (line 905 in oa_files.module).

Ive checked the code.
it seems the problem is when the function returns a FALSE :

$vids = og_vocab_get_accessible_vocabs('node', $node_type, OG_VOCAB_FIELD);

Ive replaced :

if (in_array($vid, $vids)) {

with

if (is_array($vids) && in_array($vid, $vids)) {

And theres 2 others lines with the same test in this file. To be changed also i think.

Maybe someone could provide a patch and review my solution ?