Unreal Engine Issues
Unreal Engine Issues
Crash/ensure when linking anim layers from animation update
OLD - Anim - Mar 12, 2020Originally reported here: https://udn.unrealengine.com/questions/562047/linked-layer-animation-blueprint-proxy-missing-ske.html When linking an anim layer during update, we get either an ensure or ...
Crash if the setting of PhysicalAnimationComponent is changed in the same frame as teleport processing
UE - Simulation - Physics - Apr 24, 2020Crash when ApplyPhysicalAnimationProfileBelow node and UPhysicalAnimationComponent :: UpdateTargetActors by UPhysicalAnimationComponent :: OnTeleport run in the same frame. Because RuntimeInstanceDa ...
Import then cancel while file is read leads to potential crash
TM - Interoperability - Oct 6, 20251/ Import a file with mootools such as an fbx 2/ while the file is still read, cancel the import Result : may crash few times after (when theoretically the file has finished being read) - not repr ...
Crash in FMaterialUtilities::CreateFlattenMaterialInstance when building Simplified HLOD layer
UE - Engine Scaling - Streaming - HLOD - Aug 17, 2022From licensee: The issue here starts in FVoxelizeMeshMerging::ProxyLOD() where the FlattenMaterial created using FMaterialUtilities::CreateFlattenMaterialWithSettings() returns an empty struct. I d ...
[AI] Crash when gathering heightfield geometry on worker thread
UE - Runtime - Character - Jun 25, 2025From the body of the ticket: We aim to do as much of the work off the game thread as possible to avoid impacting frame rate. We've recently found a crash during collection of the geometry slices fr ...
Level editor viewports crash when deleting actors after a layout change
UE - Editor - Apr 18, 2022Reported by a customer while testing USD import. See additional URL ...
[AI] Crash while loading navmesh with async static mesh compilation enabled
UE - Runtime - Character - Jun 16, 2022I tried 10+ times but am unable to get this to reproduce locally. Licensee reports that this is a rare crash for them. ...
Opening Particle System in Debug Mode will crash Editor
UE - Graphics Features - Sep 11, 2015Running a Project in Debug Mode and attempting to open a Particle System using a DepthFade node in Material will crash the Editor with the message listed in Callstack ...
FBasePassMeshProcessor crashes in ODSC code because the WorldGridMaterial doesn't support translucency
UE - Rendering - Architecture - Jan 30, 2023UDN: [Link Removed] Slack: [Link Removed] Then, the return value of TryAddMeshBatch is determined by FBasePassMeshProcessor::Process. When the crash occurs, GetBasePassShaders fails to get the shad ...
UMG - Drag/Drop crash on exit when dropping back onto an old slot.
UE - Editor - UI Systems - Jan 7, 2015When dragging and dropping a widget onto an old slot, it resulted in a crash on exit. ...