[BUG] Exception while stopping playmode.

[forcepusherParticipant]

Repro link (with Nodecanvas cut from the project): https://drive.google.com/open?id=1qrvA_7u1j784vq43RC0rVmaCB6-TlM2l

Steps to reproduce:
1. Open “StartHere” scene in any Unity version 2019.3.10f1 -209.3.12f1.
2. Enter and exit Playmode repeatedly until you see the exception. It occurs about 30-50% of the time.
3. Observe the exception:
Some objects were not cleaned up when closing the scene. (Did you spawn new GameObjects from OnDestroy?)
The following scene GameObjects were found:
_MonoManager

[GavalakisKeymaster]

Hello,
This has been fixed already. To fix this, please open up Graph.cs file and change line #528

From this:
Debug.Assert(Threader.applicationIsPlaying, "StartGraph should have been called in play mode only.");

To this:
Debug.Assert(Application.isPlaying, "StartGraph should have been called in play mode only.");

Please let me know if that works for you (or if you want me to send you the fix to your registered email)

Thanks,

[forcepusherParticipant]

Hello. Thanks for responding, but that didn’t solve the problem in a production game, neither the reproduction project.
This is a minor issue, possibly related to exiting playmode during a scene load awaiting activation.
It could be worked around by manually allocating MonoManager in one of the singleton GameObjects, so we’re not in a rush.
Regards.

[GavalakisKeymaster]

Hello again,

I checked out the reproduction project you’ve sent me (thanks).
It seems that the issue is only caused in conjunction with the LoadSceneAsync (allowSceneActivation = false) task that exists in the BT, which seems to create some strange behaviour. A quickfix about this, is to add an extra protection check in MonoManager as to when an instance can be created. Please open up MonoManager.cs and change line number #36 to be like this:
if ( _current == null && Threader.applicationIsPlaying && !isQuiting ) {

This solves this edge case on my end. Please let me know.
Thanks 🙂

[forcepusherParticipant]

This indeed solved the problem. Thanks a lot.

[GavalakisKeymaster]

Great. Thanks for letting me know 🙂

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