Unreal Engine Issues
Unreal Engine Issues
Trigger Montage Ended Event results in Unhanded Exception
OLD - Anim - May 6, 2019TriggerMontageEndedEvent is calling RemoveAtSwap after the NotifyEnd callback which is not safe if the ActiveAninNotifyState array is modified by the callback. WorkAround: Add a Delay node befo ...
LIVE: Crash when stopping simulation after using Keep Simulation Changes feature.
Tools - Nov 10, 2014A user is experiencing a crash when using the "Keep Simulation Changes" feature in the Editor after running a simulation of their project. The user allows the simulation to run briefly before pressi ...
Assert Crash when Attempting to rename Vector variable with open split pins
UE - Gameplay - Mar 25, 2020Assert Crash when Attempting to rename Vector variable with open split pins ...
Failed assertion on creating a basic chaos geometry collection and PIE
UE - Simulation - Physics - Jan 23, 2020User encounters a failed assertion when trying to create a simple geometry collection from a box ...
GeometryCollectionPhysicsProxy::FieldParameterUpdateCallback() not removing invalid Commands, leading to performance issues
UE - Simulation - Physics - Destruction - Aug 30, 2025GeometryCollectionPhysicsProxy::FieldParameterUpdateCallback() not removing invalid Commands, leading to performance issues. The licensee has provided their analysis: We seem to have stumbled acro ...
Sqlite plugin crash on iOS
UE - Platform - Mobile - Aug 26, 2021Crash - console command stat none
Tools - Oct 7, 2020Sequencer's View Options>Expand/Collapse Nodes and Descendants (Shift+V) does not Collapse after being Expanded (UE5.6)
UE - Anim - Sequencer - Jun 25, 2025Sequencer's View Options>Expand/Collapse Nodes and Descendants (Shift+V) does not Collapse after being Expanded (UE5.6). As described in the Steps to Reproduce section, the command expands the prope ...
Access Violation crash deleting a Widget Blueprint with an unsaved Animation track - FSequencer::Tick()
UE - Anim - Sequencer - Jun 19, 2017Encountered an Access Violation crash while deleting an Widget Blueprint with an unsaved Animation Track. The callstack references FSequencer::Tick(). I was not able to reproduce this issue in UE4/ ...
Crash when confirming a directory to import a USD file to via the USD Stage window
UE - Editor - Content Pipeline - Import and Export - Nov 21, 2019Crash when confirming a directory to import a USD file to via the USD Stage window The repro does not seem to be 100% consistent and it can take a few attempts to hit the crash. The USD Stage wind ...