Did an upgrade on my synology and got this just now.
2021/07/16 18:16:55.750402 [SYS] Downloading new version v2021.07.16.2301
2021/07/16 18:17:01.614108 [SYS] Update downloaded and verified successfully.
2021/07/16 18:17:01.614158 [SYS] Shutting down for upgrade from v2021.07.15.2328 to v2021.07.16.2301
2021/07/16 18:17:01.614645 [SYS] Bonjour service stopped.
2021/07/16 18:17:01.618130 [DVR] Recording engine stopped.
2021/07/16 18:17:01.618735 [ERR] Recovered from panic: runtime error: invalid memory address or nil pointer dereference
main.StartUpdater.func1()
:65
main.performRestart()
:230
main.Restart()
:238
main.StopDVR()
:93
main.RefreshVirtual()
:453
github.com/fancybits/channels-server/dvr.(*virtualProvider).SetRecorder()
:61