Clicking "Mobile view" in the footer, e.g. https://m.mediawiki.org/w/index.php?title=Extension:GuidedTour&mobileaction=toggle_view_mobile from https://www.mediawiki.org/wiki/Extension:GuidedTour gives
MediaWiki internal error. Exception caught inside exception handler. Set $wgShowExceptionDetails = true; at the bottom of LocalSettings.php to show detailed debugging information.