Add user array_merge error message.
 

When I go into my Admincp and try to add a new user I have the following error message at the top of the frame:

"Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/admincp/user.php(545) : eval()'d code on line 11"

I'm still able to create new user accounts however I'm curious as to what the error means and how to resolve it.