Viewing email templates in wysiwyg composer causes an error

[xkhalid]

Also when I navigate to : admin/email/templates/system_messages.reviewables_reminder

I get this message :

[Moin]

I think that happens when you use the new wysiwyg mode of the composer in that input field. I can reproduce it by using the toggle.

[sam (Sam Saffron)]

Thanks for reporting, we will have a look over the next few weeks. Workaround for now is not to select rich composer in this dialog.