Unreal Engine Issues and Bug Tracker (UE-46860)

Questions & Answers

Description

The editor will crash after calling Move To Location on an AI Pawn that is using a DetourCrowdAIController

Steps to Reproduce

Open the editor
Create a new Top Down Project
Create a new DetourCrowdAIController
Create a new Pawn
Add a Floating Pawn Movement component to the Pawn
Set the Pawn's AI Controller to the DetourCrowd controller created earlier
On Begin Play, call MoveToLocation using GetRandomReachablePointInRadius as the Location and GetAIController to plug into the Controller pin
Place the pawn in the level
PIE

Result: Editor crashes

Alternate Repro w/ Project:

Open the attached project
PIE

Result: Editor crashes

Callstack

Access violation - code c0000005 (first/second chance not available)

UE4Editor_AIModule!UCrowdFollowingComponent::UpdateCachedDirections() [d:\sean.flint_z5610_streammain\engine\source\runtime\aimodule\private\navigation\crowdfollowingcomponent.cpp:335]
UE4Editor_AIModule!UCrowdFollowingComponent::ApplyCrowdAgentVelocity() [d:\sean.flint_z5610_streammain\engine\source\runtime\aimodule\private\navigation\crowdfollowingcomponent.cpp:389]
UE4Editor_AIModule!UCrowdManager::ApplyVelocity() [d:\sean.flint_z5610_streammain\engine\source\runtime\aimodule\private\navigation\crowdmanager.cpp:799]
UE4Editor_AIModule!UCrowdManager::Tick() [d:\sean.flint_z5610_streammain\engine\source\runtime\aimodule\private\navigation\crowdmanager.cpp:294]
UE4Editor_Engine!UNavigationSystem::Tick() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\ai\navigation\navigationsystem.cpp:890]
UE4Editor_Engine!UWorld::Tick() [d:\sean.flint_z5610_streammain\engine\source\runtime\engine\private\leveltick.cpp:1334]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\sean.flint_z5610_streammain\engine\source\editor\unrealed\private\editorengine.cpp:1643]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\sean.flint_z5610_streammain\engine\source\editor\unrealed\private\unrealedengine.cpp:396]
UE4Editor!FEngineLoop::Tick() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\launchengineloop.cpp:3215]
UE4Editor!GuardedMain() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\sean.flint_z5610_streammain\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

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Fixed

Component	UE - AI
Affects Versions	4.15, 4.16, 4.18
Target Fix	4.17

Fix Commit	3536642
Main Commit	3555226
Release Commit	3536642

Created	Jul 5, 2017
Resolved	Jul 13, 2017
Updated	Apr 27, 2018

UE-46860

Crash Occurs After Calling Move To Location on an AI Pawn using a DetourCrowdAIController

Crash Occurs After Calling Move To Location on an AI Pawn using a DetourCrowdAIController

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