People have contacted me about this via PM, but (sadly) as I told them, there's nothing I can do. All of that PHP code was written by the true wiki god, Ravhin ... but he doesn't play anymore, and I hate PHP
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Most likely a single Blue magelo has a weird/special character on it which is breaking things ...but unless you are Ravhin, finding that magelo will mean finding a needle in a haystack.
So, the options are, find that needle, convince Ravhin to help, or learn PHP. If you already know PHP, the custom extension source code can be found here:
https://wiki.project1999.com/utils/wikiUtils.php