Error on top of the forum threads.
 

I've just upgraded from vB ver 3.8.2 to 3.8.5 and it's showing me the following error on top of threads.

Code:
Warning: in_array() [function.in-array]: Wrong datatype for second argument in [path]/showthread.php(2171) : eval()'d code on line 426
Any idea how can I take care of this ?