Unreal Engine Issues
Unreal Engine Issues
[CrashReport] Fatal error: Cast of nullptr to Object failed
UE - Gameplay - Oct 5, 2017This is a common and longstanding crash that has affected many users since at least 4.11. Source context not available (error in user code?). User DescriptionsI was duplicating a Set function in c ...
Editor stalls on Mac after key up, mouse up
UE - Platform - Apple - Dec 19, 2019UDN user reported a performance hit on Mac with the latest Hotfix release when the user is interacting with the editor either through keyboard or mouse input. This performance hit is noticeable whe ...
Niagara Vector Field CPU access Error prevents its use in projects
UE - Niagara - Jan 31, 2020Niagara VectorFields do not function properly since "Fix CPU Access" changes are not persistently saved. After every Editor restart or reopening projects, the Niagara-VectorField driven Emitter and ...
Chaos Clothing CreateClothActor takes a long time with LODs and Self-Collision
UE - Simulation - Core - Jan 21, 2024Spawning an actor with Chaos cloth causes a hitch when LODs or Self-Collision are enabled on the cloth. LODs and Self-Collision seem to compound the issue. Self-Collision requires a collision simul ...
Point light leaking throught thin geometry
UE - Graphics Features - Oct 29, 2024In 4.27, ray traced point lights can leak through thin meshes. This bug does not exist in Unreal Engine 5, due to many of the potential rendering areas being fundamentally changed. ...
[CrashReport] Couldn't find Shader TShadowDepthVSVertexShadowDepth_OutputDepthPositionOnly
UE - Graphics Features - Sep 7, 2017This is a common crash that has occurred since at least 4.16. The one user comment mentions a plugin, but many of the crashes occur on vanilla builds. User DescriptionsVaTexAltlas plugin enabled i ...
Out-of-Bounds Access During Partial Updates of ISMC Per-Instance Custom Data
UE - Graphics Features - Jan 6, 2026When using instance custom data values, removing an instance and changing the number of custom data floats in sequence can cause an array-out-of-bounds crash. The underlying arrays are not resized ...
RHIGetAvailableResolutions returns duplicate entries when bIgnoreRefreshRate is false
UE - Rendering - Architecture - RHI - Sep 17, 2015When the RHIGetAvailableResolutions function fills the array that is passed in as the first argument, it will end up filling some slots with duplicate resolutions (including refresh rate) when the b ...
Crash report window does not open on GitHub source builds
UE - Foundation - Core - CrashReportClient - Jun 13, 2016When using a source build of 4.12, the crash report client window does not open even if Crash Report Client is manually built alongside the editor. UPDATE: Only affecting Source builds from Github. ...
Preview Instance can still trigger print strings when you PIE
OLD - Anim - Apr 10, 2015In the given answerhub example, the user has a print string coming from IsNotValid on a check of *TryGetPawnOwner*. This is returning a false negative to him when he PIE's because the Preview insta ...