[Warning]: Division by zero

Stack Dump:

errorHandler(integer(2), string("Division by zero"), string("/home/posters555/public_html/modules/rewrite/category_categories.php"), integer(512), array(array))
    [/home/posters555/public_html/modules/rewrite/category_categories.php:512]

require(string("/home/posters555/public_html/modules/rewrite/category_categories.php"))
    [/home/posters555/public_html/modules/rewrite.php:306]

require(string("/home/posters555/public_html/modules/rewrite.php"))
    [/home/posters555/public_html/index.php:196]

gotoModule(string("rewrite"))
    [/home/posters555/public_html/index.php:200]