Merge pull request #1005 from Osamaali313/fix/plugin-instances-map-race

Fix unsynchronized map write in plugin Manager.RemoveUser

Author: eternal-flame-AD

plugin/manager.go

@@ -192,7 +192,9 @@ func (m *Manager) RemoveUser(userID uint) error {
 				return err
 			}
 		}
+		m.mutex.Lock()
 		delete(m.instances, pluginConf.ID)
+		m.mutex.Unlock()
 	}
 	return nil
 }