Unreal Engine Issues
Unreal Engine Issues
Crash in FObjectReplicator::StartReplicating when removing replicated uproperty and hot reloading with two players
UE - Networking - May 10, 2016The editor crashes when the user removes the replicated uproperty from a variable and tries to hot reload while a PIE session with two players is still active. This issue was found while trying to ...
Creating Actors as default subobjects causes crash (casting Outer to Level)
UE - Gameplay - Mar 18, 2016If two custom classes are created in C++ (Class A & B) and a reference to Class A is created as a member of Class B and initialized in Class B's constructor, the editor will crash once a blueprint o ...
Printing the result of the 'Get Move Ignore Actors' node will crash the editor
UE - Gameplay - Blueprint - May 6, 2015Printing the result of the 'Get Move Ignore Actors' node will crash the editor. The Licensee found the issue while exploring a workaround for this JIRA:https://jira.ol.epicgames.net/browse/UE-14734 ...
Drag-and-drop any cooked Blueprint class asset into the level viewport crashes the editor
UE - Framework - Blueprint - Jul 14, 2025Dragging any cooked Actor-based Blueprint class asset into the level editor viewport will crash the editor when it has been configured to work with cooked assets. This is a regression that started ...
User Defined Struct causing crash due to accessing freed memory when using Stompmalloc
UE - Gameplay - Feb 14, 2019A licensee has reported that Custom Structs can cause a crash when using StompMalloc under certain situations. Regression?: No This occurs in 4.20 ...
Crash changing mesh paint material in blueprint, then changing to a different mode tab
Tools - Jul 11, 2016The editor crashes changing from mesh paint mode to another mode if the user has changed the material of an "Add Static Mesh Component" or "Add Spline Mesh Component" in a BP and compiled while in m ...
A crash can occur during a batched compile of inter-dependent Blueprint assets via commandlet.
UE - Gameplay - Blueprint - Feb 20, 2021Bulk compiling more than one Blueprint class asset without incurring a garbage collection pass in between each compile can result in a crash during reference replacement, as serialization may end up ...
FFrame::ReadProperty() occur crash if Blendspace Player node use Function to get BlendSpace Asset
UE - Anim - Runtime - Anim Blueprints - May 25, 2022If user connect a function that returns a Blendspace Asset to a Blendspace Player that BlendSpaceAsset settings are exposed to a pin, it crashes in the package. It does not occur if user do not con ...
[Synth][Tone Generator] - Editor crashes when Starting Synth Component Tone Generator
UE - Audio - Mar 29, 2022Starting a SynthComponentToneGenerator crashes the editor with the following assert:Assertion failed: bSuccess [File:D:\build\++UE5\Sync\Engine\Source\Runtime\SignalProcessing\Private\AudioBufferDis ...
Crash When Loading Cooked Material Assets in Editor Due to Shader Serialization
UE - Rendering - Architecture - Shaders - Aug 27, 2025In Unreal Engine 5.6+, the new shader serialization logic in FShaderMapResourceCode::Serialize does not correctly handle cooked assets that are loaded back into the editor (e.g., from a mounted .pak ...