Unreal Engine Issues and Bug Tracker (UE-16435)

Description

When attempting to replace references of one blueprint with another a number of error message windows pop up ([Link Removed]) and the editor will crash.

This is a regression since it was working in 4.7.6 (with the same errors mentioned in [Link Removed]) but crashes in 4.8 Preview 4 from the launcher and Main promoted build CL 2548448.

Note: These references are preventing the object from being deleted:

External referencers of Blueprint /Game/Actor1.Actor1:
   BlueprintVariableNodeSpawner /Engine/Transient.BlueprintVariableNodeSpawner_2644 (1)
      0) ObjectProperty /Script/BlueprintGraph.BlueprintFieldNodeSpawner:Field
   BlueprintVariableNodeSpawner /Engine/Transient.BlueprintVariableNodeSpawner_2645 (1)
      0) ObjectProperty /Script/BlueprintGraph.BlueprintFieldNodeSpawner:Field
   BlueprintVariableNodeSpawner /Engine/Transient.BlueprintVariableNodeSpawner_2646 (1)
      0) ObjectProperty /Script/BlueprintGraph.BlueprintFieldNodeSpawner:Field
   BlueprintVariableNodeSpawner /Engine/Transient.BlueprintVariableNodeSpawner_2647 (1)
      0) ObjectProperty /Script/BlueprintGraph.BlueprintFieldNodeSpawner:Field
   K2Node_DynamicCast /Engine/Transient.PROTO_BP_Blueprint_0:UserConstructionScript.K2Node_DynamicCast_499 (1)
      0) ClassProperty /Script/BlueprintGraph.K2Node_DynamicCast:TargetType
   K2Node_ClassDynamicCast /Engine/Transient.PROTO_BP_Blueprint_0:UserConstructionScript.K2Node_ClassDynamicCast_495 (1)
      0) ClassProperty /Script/BlueprintGraph.K2Node_DynamicCast:TargetType

Shortest reachability from root to Blueprint /Game/Actor1.Actor1:
Blueprint /Game/Actor1.Actor1 [target] (standalone)

Crashreporter:
[Link Removed]

Steps to Reproduce

1. Open QA Game
2. Create 2 blueprints based on Actor
3. Add a Static Mesh component to both blueprints
4. Add instance of BlueprintA to the scene
5. Select both BlueprintA and BlueprintB in the content browser
6. Right click and select Asset Actions -> Replace References
7. In the pop up window choose the asset that was not placed in the level (BlueprintB) and click on Consolidate Assets
8. In the Delete Assets window click the Delete button

Result:
Critical Failure window pops up and editor crashes after clicking OK

Expected:
BlueprintA is deleted and replaced with BlueprintB

Callstack

MachineId:9FA88CA44B7C623122B0039D6C8BA1B0
EpicAccountId:c807849e05a0413d99e379f2802cae9c

Unknown exception - code 00000001 (first/second chance not available)

"Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp] [Line: 366] 
Invalid object in GC: 0x00000

KERNELBASE
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\misc\outputdevice.cpp:360]
UE4Editor_CoreUObject!FArchiveRealtimeGC::ProcessObjectArray() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:803]
UE4Editor_CoreUObject!TGraphTask<FArchiveRealtimeGC::FGCTask>::ExecuteTask() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\public\async\taskgraphinterfaces.h:771]
UE4Editor_Core!FTaskThread::ProcessTasks() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\async\taskgraph.cpp:430]
UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\async\taskgraph.cpp:273]
UE4Editor_Core!FTaskThread::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\async\taskgraph.cpp:564]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:73]
UE4Editor_Core!FRunnableThreadWin::GuardedRun() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:26]
kernel32
ntdll

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Cannot Reproduce

Component	UE - Gameplay - Blueprint
Affects Versions	4.8
Target Fix	4.13

Fix Commit	2974882
Main Commit	2985633

Created	Jun 1, 2015
Resolved	May 12, 2016
Updated	Apr 27, 2018

View Jira Issue

UE-16435

Replacing blueprint assets causes editor to crash

Replacing blueprint assets causes editor to crash

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