Thread:Project:Support desk/Article names only numbers with length of 8 or 13/reply (14)

I added for testing purpose the extension GraphViz which is also using the onPageContentSave hook. When modifying the _body file to misformed php my wiki stops loading so the file is definitely been loaded from the wiki. But when I insert a  or a   like this: as first command of the function onPageContentSave the article saving process is not affected at all. Could someone try to enlighten me? :/