Level crashes in packaged build or second player in multipler PIE

Development Platform & Builds
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1

When running PIE (new window) with 2 players found that editor crashes with below assertion:

Error: Error reentered: Assertion failed: IsInRenderingThread() || IsInGameThread() || IsAsyncLoading() || GIsSavingPackage [File:Runtime\Engine\Private\Materials/MaterialInstanceSupport.h]

Tested in a blank level and don’t get it so seems to be something to do with my level but was working fine in 4.24.

Found that the crash isn’t to do with multplayer as it also occurs when PIE as standalone with only one player. Tested as packaged build and, sure enough, that crashes too with same error.

I can attach full stack trace if needed but doesn’t seem very useful - found a few bugs on bug tracker with same assertion/trace but completley different bug.

2

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://epicsupport.force.com/unrealengine/s/

Thanks

3

Hi Mr Gamgee,

Thanks for the reply. I know about the new bug reporting system (have reported a bug or two using it already).

Probably should have said in question that the reason I hadn’t reported it as a bug is that I can’t work out what is causing it/make it reproducible enough to report one.

4

You ever discover the cause?

5

Nope, afraid not. I just haven’t been using that level for a while. Need to go back at some point and try and figure it out.