To reproduce this bug:
- Create User1 and User2 in seperate User groups
- Create Action to send notification to User1
- Execute created Action
- Log in with User2
- In Dashboard (Last 20 issues) or Monitoring (Events) if we click on Actions:1 column USER is empty, however if we click on ACK, in USER column we can see User1
- If we open Event Details - in Recipients column there are no Username. Plus in the bottom error
If both users are in same usergroup nothing of this happens.