error after logged off

I updated module to 6.x-2.0-beta5 and after I logged off site I got the following error on home page.

* warning: in_array() [function.in-array]: Wrong datatype for second argument in /home/content/g/r/e/example/html/sites/all/modules/ad/owners/ad_owners.module on line 577.
* warning: in_array() [function.in-array]: Wrong datatype for second argument in /home/content/g/r/e/example/html/sites/all/modules/ad/owners/ad_owners.module on line 577.