Change Details

reproduction: # enable Hovercards (under "Beta") in your mediawiki account. # open [[https://www.mediawiki.org/wiki/MediaWiki_1.24?debug=17 | any page with TOC in mediawiki ]] in "debug" mode (i.e., append "?debug=17" to the address line) # open JS console ( hotkey: F12 on many browsers ) # click a TOC item and watch the exception report in the console # disable hovercards, and repeat 2-4. notice that there are no exceptions. peace.