Unreal Engine Issues
Unreal Engine Issues
On NM_Client, GameplayDebugger defaults to green smiley for NPCs implying running BehaviorTree while AI info is unknown
UE - AI - Debugging - Mar 12, 2024Context GameplayDebugger (Press ` in-game) displays a green smiley (AICON-Green) for AIControlled pawns that are running a BehaviorTree and a red angry face (AICON-Red) otherwise. If the AIControll ...
Crash when displaying lumencards on map with many objects
UE - Graphics Features - Lumen - Aug 1, 2025There is a thread conflict between FRDGBuilder execution in Background Worker and LumenVisualizer's LumenCard add/delete process. When lumen cards are displayed in a scene with many objects, a crash ...
Crash Occurs When One Morph Target is Deleted and Another is Adjusted Afterward
UE - Graphics Features - Feb 26, 2018Engine crashes when a morph target on an asset that has multiple morph targets is deleted and then another morph is adjusted afterwards Notes: Asset came from an older Jira where this same issue o ...
GameThread + AsyncLoadingThread deadlock - StaticLoadObject vs. StaticAllocateObject
UE - CoreTech - UObject - Feb 14, 2023User reported encountering a deadlock between GameThread and AsyncLoadingThread and provided two callstacks.User quote I've been running into a deadlock intermittently with a custom blueprint conso ...
Assert when adding geometry cache asset as a component to a blueprint actor
UE - Editor - Content Pipeline - Import and Export - Mar 24, 2021When adding an asset directly to a blueprint, it is not in the streaming components, so the assertion fails when setting the geometry cache. ...
Animation System relies on FindFunctionByName which is not thread safe.
OLD - Anim - Mar 29, 2017Currently, there are several places in FAnimInstanceProxy and FAnimNode_Base (and derived classes) that rely on FindFunctionByName in order to resolve transitions, evaluate pins, etc. This can happ ...
Editor Crashes When Using Set Replicates in the Construction Script
UE - Networking - Mar 1, 2016When spawning an actor using the Spawn Actor From Class node that has a Set Replicates node in the construction script, the editor crashes upon attempting to run a dedicated server with 2 players. ...
Crash accessing USplineComponent from Niagara while it is being updated on game thread
UE - Niagara - Aug 13, 2020I was working with a licensee on something unrelated, and ran into this niagara threading crash. It looks like UNiagaraDataInterfaceSpline::SampleSplinePositionByUnitDistance on one of the niagara h ...
Vehicle using Async Scene Crash
UE - Simulation - Physics - Nov 6, 2018Setting a Vehicle to Asynchronous physics will cause a crash. Confirmed in 4.22 Main at CL 4542756 ...
Duplicating a map crashes the editor (Blueprint compile crash)
UE - Gameplay - Blueprint - Jan 5, 2015EDIT: Date: 1/21/2015 Adding the [Link Removed] Duplicating a map in the Content Browser crashes the editor. It does not matter if the map being duplicated is the currently open map or not. EDIT ...