Forum Style Manager Warning
 

Whenever I go into my Style Manager and hit 'All Style Options' no matter what Style I click (besides the Mobile Default) I get this error...

Warning: Invalid argument supplied for foreach() in [path]/admincp/css.php on line 451

Screenshot: http://prntscr.com/lnj61

What should I do to resolve this, and what is the cause of this? Thanks in advance!