Proton: Beat Saber log file gets filled with NullReferenceException (620980)

[Corben78]

Since Proton 3.16-9 the log file under SteamLibrary/steamapps/compatdata/620980/pfx/drive_c/users/steamuser/AppData/LocalLow/Hyperbolic Magnetism/Beat Saber/output_log.txt gets filled with these exceptions:

NullReferenceException: Object reference not set to an instance of an object
  at (wrapper managed-to-native) System.Object.wrapper_native_0000000006D003C0(Valve.VR.VREvent_t&,uint)
  at Valve.VR.CVRSystem.PollNextEvent (Valve.VR.VREvent_t& pEvent, System.UInt32 uncbVREvent) [0x00061] in <e214f8ec5d4d45eeb4a35631e2607e94>:0 
  at OpenVRHelper.Update () [0x0002b] in <26ec787945bf43e5aae4af5dd3394845>:0 
  at VRPlatformHelper.Update () [0x00008] in <26ec787945bf43e5aae4af5dd3394845>:0 

(Filename: <e214f8ec5d4d45eeb4a35631e2607e94> Line: 0)

Here the log files for Proton 4.11-3 and 3.16.9:
output_log-4.11-3.txt
output_log-3.16-9.txt
This seems not to happen with 3.7-8:
output_log-3.7-8.txt

Here are the corresponding proton log files, with PROTON_LOG=1 %command%:
steam-620980-3.7-8.log
steam-620980-3.16-9.log
steam-620980_4.11-3.log

When using mods with Beat Saber, these error messages are duplicated into the log files of the mods as well, letting them grow quickly into hundreds of megabytes, which might cause side effects, especially with performance.

My steam system information:
system_information.txt

Steam VR system report:
SteamVR-2019-09-08-PM_02_24_18.txt

[aeikum]

Thanks for the very nice bug report. I see the problem and will have a fix for it soon.

[aeikum]

The problem turned out to be more complicated than I thought. Didn't manage to get it done in time for 4.11-4, hopefully next release.

[Corben78]

Was just about to check out 4.11-4, no worries and thank you for keeping us posted!

[aeikum]

Still not in 4.11-5, but I'm working on it :)

[Corben78]

I guess the release window for 4.11-6 was also too short, wasn't it?

[aeikum]

Yeah, not yet, sorry. I have it completed, but we haven't had time to do a QA pass on it yet. If you're curious, I pushed the branch over here https://github.com/aeikum/Proton/tree/proton_4.11-vrclient

[aeikum]

Hooray, this should be fixed in 4.11-7. Thanks for your patience. Please retest (you may need to restart the Steam client for it to update).

[Corben78]

Played yesterday 2h of Beat Saber on stream and no signs of the NullReferenceException in the log files anymore. I also have the impression it has helped with most of my frame drops. Thank you very much!

[kisak-valve]

Thanks for retesting, closing as fixed.