Regression caused by CKEDITOR-423 due to a typo in https://github.com/xwiki-contrib/application-ckeditor/commit/05459ec37d065217f7b0d92ee5e6913dab9bfbea#diff-20cc9fa7edf4b49f4ade6f5c067cd6636fbed8559e6ab0b98914f367424e4455R165 .