CONSTANT crash when reimporting a .fbx

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

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

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

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

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.

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

1 Like

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…