Unreal Engine Issues

Crash from generated Merged Actor with no created lightmap UV

If you import a static mesh with no setup lightmap and uncheck the option for Generate lightmap UV so that only the UV Channel 0 is present. When you use the Merge Actor tool with a single one of th ...

Crash when double clicking a level in Content Browser to open it

Crash when after playing media that requires a different conversion shader

The pixel format conversion code in MediaTextureResource is currently reusing the global bound shader state for different pixel shaders. This is not supported. There needs to be one shader state per ...

FAsyncIOSystemBase::QueueDestroyHandleRequest fatal error crash on launch or package

Fatal error due to FAsyncIOSystemBase::QueueDestroyHandleRequest during launching and packaging projects. May be linked to: [Link Removed] ...

Force Delete of Referenced SpeedTree Instance causes Crash

This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Error message: Assertion failed: IsValid() [Link Removed] [Line: 780] Source Context: 1873 ...

Disabling LQ lightmaps causes crash on mobile preview

Crash in Particle System GetVertexAndIndexData on certain OPPO devices

When show propertymatrix and delete target actor, the editor crash

It looks like it is null reference in propertymatrix. It always occurs when I execute the reproduction procedure. ...

Calling UHierarchicalInstancedStaticMeshComponent::AddInstance multiple times causes crash

Calling UHierarchicalInstancedStaticMeshComponent::AddInstance multiple times causes multiple BuildTrees to be created and run asynchronously at the same time. Tested in 4.21(CL - 4613538) How t ...

AR Handheld Template crashes when launched on to Android device

AR Handheld template appears to close immediately after opening on Android device ...