[Warning]: Division by zero

Stack Dump:

errorHandler(integer(2), string("Division by zero"), string("/home/iceposter/public_html/modules/rewrite/category_categories.php"), integer(519), array(array))
    [/home/iceposter/public_html/modules/rewrite/category_categories.php:519]

require(string("/home/iceposter/public_html/modules/rewrite/category_categories.php"))
    [/home/iceposter/public_html/modules/rewrite.php:300]

require(string("/home/iceposter/public_html/modules/rewrite.php"))
    [/home/iceposter/public_html/index.php:217]

gotoModule(string("rewrite"))
    [/home/iceposter/public_html/index.php:220]