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Crash when opening UMG widgets in 4.10

I upgraded a project from UE4.8 to UE4.10. Now, when I open UMG widget Blueprints, the Editor crashes. I've had this crash happen on both the OS X and Windows binary versions. The CrashContext-runtime.xml file (generated during a crash on Windows 10), lists the error as:

Assertion failed: IsValid() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.10\Engine\Source\Runtime\Core\Public\Templates\SharedPointer.h] [Line: 739]

I was able to replicate the error in a blank project by migrating the problem file (and all linked files) to the blank project.

I've pasted the full contents of the CrashContext-runtime.xml file below (I couldn't attach the file) (for privacy I redacted the MachineId and EpicAccountId:

 <?xml version="1.0" encoding="UTF-8"?>
 <BaseDir>C:/Program Files/Epic Games/4.10/Engine/Binaries/Win64/</BaseDir>
 <RootDir>C:/Program Files/Epic Games/4.10/</RootDir>
 <ErrorMessage>Assertion failed: IsValid() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.10\Engine\Source\Runtime\Core\Public\Templates\SharedPointer.h] [Line: 739] 
 <MiscCPUBrand>      Intel(R) Core(TM) i7-3720QM CPU @ 2.60GHz</MiscCPUBrand>
 <MiscPrimaryGPUBrand>NVIDIA GeForce GT 650M</MiscPrimaryGPUBrand>
 <MiscOSVersionMajor>Windows 10</MiscOSVersionMajor>
Product Version: UE 4.10
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asked Nov 16 '15 at 05:33 AM in Bug Reports

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3 answers: sort voted first

The workaround in the following AnswerHub question solved the issue: https://answers.unrealengine.com/questions/327412/assertion-failed-isvalid-filedbuildfarm.html

I was able to use this workaround to access the UMG Blueprint in both the Windows and OS X binary versions of 4.10.0.

Here's the answer from that post:

We were able to reproduce this crash in a clean project. We have written up a report (UE-23217) and it has been submitted to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. During testing we found that the issue was caused by closing the animation and timeline windows. Thank you for your time and information.


Window > Reset Layout will allow you to open the blueprint again.

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answered Nov 16 '15 at 03:49 PM

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maybe it can help : link text

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answered Nov 16 '15 at 07:18 AM

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avatar image JonathanADaley Nov 16 '15 at 01:21 PM

Thanks for the link. I'll give it a go.

avatar image SentryTheDefiant Nov 28 '15 at 06:47 PM

Can confirm that this solution works as I had this same issue.

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Here is a workaround for the issue:

  1. Create a blank Blueprint project in UE 4.9

  2. In UE 4.10, Migrate your UMG asset to the blank UE4.9 project (make sure to migrate all referenced files)

  3. Make changes to UMG file in UE4.9 project

  4. Copy the UMG .uasset file (and any modified referenced files) from the UE4.9 project's Content folder into your UE4.10 project's Content folder, overwriting the file in the UE4.10 project

This allowed me to fix an issue with the size of an image in the UMG widget. And, when I play the game in PIE in UE4.10, the fix is retained.

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answered Nov 16 '15 at 05:55 AM

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