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v4.4 crash in UEditorEngine::TeardownPlaySession

In PlayLevel.cpp:336

SlatePlayInEditorSession is dereferenced even if is NULL. As the previous if statement does check if the value is NULL, I'd expect this if statement to as well.

I'd made some other modifications to fix another issue which resulted in SlatePlayInEditorSession being null, and hit this crash....

Product Version: Not Selected
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asked Aug 27 '14 at 11:37 PM in Bug Reports

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avatar image Tim C ♦♦ STAFF Aug 28 '14 at 08:01 PM

Hi Roxie,

We will look into this issue for you. Would you be able to let us know what modifications you had made previously?

avatar image Roxie Aug 28 '14 at 09:12 PM

I made a modification to address https://answers.unrealengine.com/questions/89909/v44-pie-network-login-odd-interactions-with-the-on.html

To do that, I modified UGameInstance::InitPIE to take an additional WorldContextHandle (defaulting to none). If a valid handle is passed in, then I lookup that world context, instead of creating a new one.

Additionally, I made a modification to address https://answers.unrealengine.com/questions/89896/in-pie-standalone-why-doesnt-the-editor-log-into-t.html

I modified PlayLevel.cpp:1889 to run the OnlineSubsystem login regardless of the PlayNetMode.

These changes may or may not have anything to do with this issue...I'm still investigating.

avatar image Roxie Aug 29 '14 at 04:58 PM

FYI, I fixed some of this stuff as noted in https://answers.unrealengine.com/questions/89883/v44-crash-during-networked-play-in-editor.html

My thoughts on the cause are there as well.

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Hi Roxie,

Thanks for pointing this out. This issue has actually been fixed in our main branch, and is accessible in the latest code available on GitHub. Of course the fix will also be included in the 4.5 release!

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answered Aug 29 '14 at 05:04 PM

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Ryan Gerleve STAFF
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avatar image Roxie Aug 29 '14 at 05:25 PM

You guys rock. I'll use 4.5 when it comes out.

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