Removing Team Members causes Instance Corruption

[ghost]

• Gitea version (or commit ref): 1.4.3 (also 1.4.1)
• Git version: one of the latest
• Operating system: Windows Server 2012
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL Server 2014 - 12.0.2000
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:

Description

to reproduce:

1. create Organization
2. create Repository within Organization
3. Add Team and Team Member
4. Remove added Team Member
   Klick on on "Remove" ends with error:
   err: " read tcp 192.168.1.120:56709->192.168.1.120:49398: i/o timeout"
   ok: false

Then Gitea became useless for all users:
Loading Sites toggles between Error 500 and empty Organization/Repository list. Always Error 500 loading Issues and Pull Requests. Random behaviour (for example: once loaded another Profile).

Also can't clone (not allowed access) or push (repository not found) created repository.
After restarting Gitea everything is fine but the Member was not removed.

[leepfrog-ger]

I think this is the same as my issue in #4362