Crash when building HTML5

Development Platform & Builds
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1

Unreal always crashes when building for HTML5.

Errormessage:

Assertion failed: !Export.ClassIndex.IsNull() [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp] [Line: 4630]

After re-opening it works.

BuildVersion:
++UE4+Release-4.18-CL-3709383

EngineVersion:
4.18.0-3709383+++UE4+Release-4.18

Cannot find any error either in BP or C++

Logfile: link text

2

looks like this issue is already being tracked at:

and a sort of related one at:

3

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://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks