Crash when generate hair cards

Tosom · August 17, 2025, 10:14am

Hi, I’m trying to generate hair cards but when I click on “Generate” Unreal crash and get this log:

LoginId:3d14e33444bcc6ec0b078bad6dc2b412
EpicAccountId:3eb39551728e4e898cce4cfa542deb32

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000001fe15fe382d

UnrealEditor_Core
UnrealEditor_Core
ntdll
ntdll
ntdll
ntdll
ntdll
ntdll
ntdll
KERNELBASE
python311
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UnrealEditor_PythonScriptPlugin
UnrealEditor_PythonScriptPlugin
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_HairCardGeneratorEditor
UnrealEditor_HairCardGeneratorEditor
UnrealEditor_HairCardGeneratorEditor
UnrealEditor_HairStrandsEditor
UnrealEditor_HairStrandsEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

I’m using UE 5.6.
How can I solve this issue?

Thanks in advance.

brs-sebascova · August 18, 2025, 4:36am

Hello there @Tosom!

From your provided log, the crash is most likely ocurring due a Python bridge conflict. If something is wrong in that section, the generator will suffer an access violation crash. There are a few steps we can try here:

First, make sure your asset is properly setup (strands and simulation)
Then, test by disabling/re-enabling the “Python Editor Script Plugin” in UE’s config
If that doesn’t change the outcome, try running UE with “-NoPython” rule

There are also more general methods to implement, in case Python is ruled out as the issue’s origin:

Update your GPU drivers, via a clean install, and choosing Developer drivers, if available
Perform a clear cache, via delete folders Binaries and Intermediate from your project’s directory, then allow the engine to rebuild. After that, please test generating hair in a new asset