Unreal Engine Issues and Bug Tracker (UE-194345)

Description

Ran into a crash when trying to programmatically add foliage to a large WP level with some unloaded IFAs.

Steps to Reproduce

In a World Partition level, unload all the Instanced Foliage Actors via the Outliner
Via an Editor Utility Blueprint or Widget, run the AddInstances function on the Editor World to add a foliage instance of whatever FoliageType you have available. If all your IFAs are unloaded, you should just need to pass in a single transform at 0,0,0.

Callstack

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000005f0
UnrealEditor_Foliage!AInstancedFoliageActor::AddFoliageType() [D:\UE5\Engine\Source\Runtime\Foliage\Private\InstancedFoliage.cpp:3750]
UnrealEditor_Foliage!AInstancedFoliageActor::AddInstances() [D:\UE5\Engine\Source\Runtime\Foliage\Private\InstancedFoliage.cpp:4982]
UnrealEditor_Foliage!AInstancedFoliageActor::execAddInstances() [D:\UE5\Engine\Intermediate\Build\Win64\UnrealEditor\Inc\Foliage\UHT\InstancedFoliageActor.gen.cpp:38]
UnrealEditor_CoreUObject!UObject::execCallMathFunction() [D:\UE5\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1069]
UnrealEditor_CoreUObject!ProcessLocalScriptFunction() [D:\UE5\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1203]
UnrealEditor_CoreUObject!UObject::ProcessInternal() [D:\UE5\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1300]
UnrealEditor_CoreUObject!UFunction::Invoke() [D:\UE5\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:6411]
UnrealEditor_CoreUObject!UObject::ProcessEvent() [D:\UE5\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2131]
UnrealEditor_Engine!FLatentActionManager::TickLatentActionForObject() [D:\UE5\Engine\Source\Runtime\Engine\Private\LatentActionManager.cpp:314]
UnrealEditor_Engine!FLatentActionManager::ProcessLatentActions() [D:\UE5\Engine\Source\Runtime\Engine\Private\LatentActionManager.cpp:232]
UnrealEditor_Engine!UWorld::Tick() [D:\UE5\Engine\Source\Runtime\Engine\Private\LevelTick.cpp:1557]
UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\UE5\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1695]
UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\UE5\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:519]
UnrealEditor!FEngineLoop::Tick() [D:\UE5\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5812]
UnrealEditor!GuardedMain() [D:\UE5\Engine\Source\Runtime\Launch\Private\Launch.cpp:188]
UnrealEditor!GuardedMainWrapper() [D:\UE5\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:107]
UnrealEditor!LaunchWindowsStartup() [D:\UE5\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:244]
UnrealEditor!WinMain() [D:\UE5\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:284]
UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Unresolved

Component	UE - World Creation - Worldbuilding Tools - Foliage
Affects Versions	5.2.1
Target Fix	5.5

Created	Aug 31, 2023
Updated	Feb 13, 2024

UE-194345

Crash when adding foliage instances to unloaded IFA

Crash when adding foliage instances to unloaded IFA

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