we used MeetingCustom.php to overwrite set_notification_body what worked fine in older versions (6.x, 7 lower than 7.6). After updating wie get the error "View renderer failed" (like this, we have it in german "View Render Fehlgeschlagen").
The error message for the list view in the browser console is:
ERROR[2016-3-17 11:43:31]: Failed to render view-preview-view82-<no-id>/Meetings/bean:Meetings/<no-id>/coll:Meetings-0
TypeError: this.model.get(...).add is not a function
The list view shows entries, the entry view shows "no data" ("Keine Daten zur Verügung") with this error message:
FATAL[2016-3-17 11:49:9]: uncaught exception: the value must be a BeanCollection at on line 0
We tried to repair and rebiuld everything, removed and readded the extended class and so on. Is there any workaround for this bug without changing the original Meetings class?