GUI hangs on Email Notifiations

Hi

We are valuating the version 1.4.2.3958 frontend of Clustercontrol.

Everything works fine except for the fact that entering "Email Notifications" hangs with the spinning Loading...-image.

Pressing F12 in Chrome shows that everything loads fine, it's just that the GUI won't show the data at all.

This is quite annoying as the only thing I would like to do is to shut down email notifications, as we are using slack.

Anyone know how to fix this or what to alter in the database so that the emails stops?

BR Stefan