I just received this error on my forum header
Warning: array_keys() [function.array-keys]: The first argument should be an array in [path]/includes/functions.php on line 4290

Warning: Invalid argument supplied for foreach() in [path]/includes/functions.php on line 4290

Let all users without permissions to access the forums and subforums and administrators does not allow us to enter the administration panel

The version of my vbulletin is 3.8.7 and all hacks are disabled