MathML error message
When trying to view some pages on this wiki, you might get the error message in your browser
MediaWiki internal error. Exception caught inside exception handler. Set $wgShowExceptionDetails = true; at the bottom of LocalSettings.php to show detailed debugging information
This appears to occur on pages that have equations set with <math> </math>, if you are logged in and have math output set to the MathML option.
The workaround for this problem is to go to Special:Preferences and change your "Math" setting to "PNG" from "MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools)" . Despite the comment that it is recommended, it is now deprecated in MediaWiki .