Problem with error message Argument #2 is not an array Help!

[River_rush]

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /index.php(537) : eval()'d code on line 249

getting this error on logout and refresh anyone have a clue? is it server or client side?
cheers.

[nexialys]

it is HACK side... we can't help if we do not know what you have on your board...

this error comes when an information is missing during the process... so you have something installed on your board that bring this error...

Deactivate all your plugins/products and startover...

[River_rush]

it was the SiteTeam hack, thanks