CONSTANT crash when reimporting a .fbx

Development Platform & Builds
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1

UE Editor 5.0.3
Windows 10
DirectX 12
RTX 2080ti

Whenever I try to reimport a simple .fbx or.obj (a single cube exported from Blender), UE crashes.

It will crash whether the asset was modified or not.

I’m using a single cube to simplify the scene and make it easier to narrow down the problem.

The crash report is different every time except for a few lines at the bottom.

I’ve had the same crash for multiple builds of UE.

Steps to reproduce:

  • “Import Into Level” a .fbx or .obj
  • “Reimport” the asset by right clicking on it in the browser.
  • UE will crash (may take a couple of tries).

Here’s a sample crash report:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000000000006b

UnrealEditor_Core!_mi_heap_malloc_zero() [D:\build\++UE5\Sync\Engine\Source\ThirdParty\mimalloc\src\alloc.c:147]
UnrealEditor_Core!mi_heap_malloc_zero_aligned_at() [D:\build\++UE5\Sync\Engine\Source\ThirdParty\mimalloc\src\alloc-aligned.c:47]
UnrealEditor_Core!mi_realloc_aligned() [D:\build\++UE5\Sync\Engine\Source\ThirdParty\mimalloc\src\alloc-aligned.c:187]
UnrealEditor_Core!FMallocMimalloc::Realloc() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\MallocMimalloc.cpp:129]
UnrealEditor_Core!FMemory::Realloc() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\HAL\FMemory.inl:56]
UnrealEditor_Engine!TArray<UE::Math::TTransform<double>,TSizedDefaultAllocator<32> >::ResizeForCopy() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h:2814]
UnrealEditor_Engine!Audio::FAudioDebugger::SendUpdateResultsToGameThread() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\AudioDebug.cpp:2402]
UnrealEditor_Engine!FAudioDevice::Update() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\AudioDevice.cpp:4561]
UnrealEditor_Engine!FAudioDeviceManager::IterateOverAllDevices() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\AudioDeviceManager.cpp:963]
UnrealEditor_Engine!FAudioDeviceManager::UpdateActiveAudioDevices() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\AudioDeviceManager.cpp:944]
UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:2052]
UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:474]
UnrealEditor!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5215]
UnrealEditor!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:183]
UnrealEditor!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
UnrealEditor!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
UnrealEditor!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
UnrealEditor!__scrt_common_main_seh() [d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll
1 Like
2

In reference to another post, if you also reimport textures, it won’t crash.

3

I have this problem in UE4 when I open the damaged level. Someone mentions Windows DEP, but it only works with 32-bit programs.

4

I have this issue in 5.1 too
Impossible for me to reimport fbx after it was imported using “import into level”

1 Like
5

SOLUTION! [UE 5.1.1]

This kept happening to me and I found that if the asset is already in the level and you try to reimport it UE5 will crash. If you create and open a new level without any references to the mesh before reimporting UE shouldn’t crash.

6

I’m having the exact same problem, I guess this should be fixed since it’s a bug.

1 Like
7

I keep having the same problem today, in Unreal 5.3.1 on Linux.
Regardless of how I import the FBX model and then try to Reimport the editor crashes without any error messages.

Curiously it worked fine yesterday, and today I opened the project and now every reimport crashes the editor - even after I delete the model and import it fresh…

8

I’m having the same issue in 5.3.2 when reimporting assets that were imported via “import into level”.

The issue okay after having restarted the engine and attempting to reimport said asset.

I’ve replicated the error in fresh projects with different objects, same problem.

2 Likes
9

The issue still occurs as of 5.4.3. Importing an fbx by hitting File > Import into Level, closing and reopening the editor, then attempting to reimport causes the engine to crash trying to open the reimport settings window. It doesn’t seem to matter what the actual contents of the fbx are, and I’ve tried it with fbx files imported from both Maya and Houdini. If you import an fbx via Import into Level and then try to reimport it in the same editor session then the crash will not occur; it only happens after closing and reopening the editor at least once, but then it will always happen from then on.

I have not found any way to work around it whatsoever short of deleting everything and importing fresh, which is atrocious and utterly unacceptable. I have submitted multiple bug reports for each version and hotfix that fails to address the issue and it has gone completely ignored every time.

1 Like
10

I have exactly same problem and it’s already 5.4.3, it’s impossible to work with archviz projects like that. I need to constantly delete my whole scene and setup materials again after every change - MADNESS! Does anyone found a fix for that?

1 Like
11

I have the same problem. The only solution I can use is to remove MESHES (materials, textures, etc. DO NOT DELETE) from the content browser , save all, import and you have old FBXscene blueprint, R click - asset action- select actors using this asset. You will receive your materials and coordinates, but you will need to add meshes in the details window. If you have a small number of meshes, but you need to save coordinates and materials, it will be faster than deleting everything and reloading it

12

This appears to have finally been fixed in 5.5, however if you upgrade directly then any existing scene import assets will remain corrupted and will still crash upon trying to reimport. Importing a new scene though now lets you reimport it without crashing anymore.