**Describe the bug**
A clear and concise description of what the bug is.
**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See er…
**To reproduce:**
- Create a test-user eg: aaa
- Create a role eg: test-role
- Assign test-role to aaa
- Delete role test-role -> Server crashes
**Error log**
```
syncer-server-filesys…