Warning: array_merge() [function.array-merge]: .....
 

When I go to Add a New User in Admincp I see this message at the top of the page

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/admincp/user.php(480) : eval()'d code on line 11

I've looked at line 11 of user.php and it doesn't seem to correlate to this warning at all. Any ideas?

I'm not a coder so I don't understand what the message means!