Forum Error Messages when reverting templates
 

I get these error messages when I try and revert a template? Any ideas as to why this is happening?

Code:
•Default Style ... (Templates) (StyleVars) (Replacement Variables) (CSS) (Controls)
Warning: Invalid argument supplied for foreach() in [path]/includes/adminfunctions_template.php on line 913

Warning: Invalid argument supplied for foreach() in [path]/includes/adminfunctions_template.php on line 913

Warning: Invalid argument supplied for foreach() in [path]/includes/adminfunctions_template.php on line 913

Warning: Invalid argument supplied for foreach() in [path]/includes/adminfunctions_template.php on line 913
Done.