In the security configuration page, the administrator is capable to choose the authorization method GitHub Committer Authorization Strategy without having chosen the authentication to Github Authentication Plugin. 

Currently there is a warning in the help box of the authorization: "Requires the Github Authentication Plugin to be used as the authentication source."

It could be better to have a medium-size orange/red inline warning always displayed (not only when clicking on the help button) as this configuration will simply block the whole system.