Unreal Engine Issues and Bug Tracker (UE-46054)

Description

When using the Add Child Actor Component node with a class set on the node with Blueprint Nativization enabled, the packaged game crashes upon launch. A workaround for this is to leave the class blank on the node and set it at a later time.

Regression?: Yes
This did not occur in 4.15.3-3450819+++UE4+Release-4.15

Steps to Reproduce

Download the attached project
Package the project for Windows 64-bit
Launch the packaged game
Result: The application comes up with a message mentioning that NODE_AddChildActorComponent-0_Actor_CAT in Package /Game/NewBlueprint was not found, according to the logs, this is a crash
Expected: The packaged game starts normally

Callstack

[2017.06.14-16.36.13:152][  0]LogWindows:Error: === Critical error: ===
[2017.06.14-16.36.13:152][  0]LogWindows:Error: 
[2017.06.14-16.36.13:152][  0]LogWindows:Error: Fatal error: [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp] [Line: 2781] 
[2017.06.14-16.36.13:152][  0]LogWindows:Error: Missing import of (/Game/NewMap): NODE_AddChildActorComponent-0_Actor_CAT in Package /Game/NewBlueprint was not found, but the package exists.
[2017.06.14-16.36.13:152][  0]LogWindows:Error: 
[2017.06.14-16.36.13:152][  0]LogWindows:Error: 
[2017.06.14-16.36.13:152][  0]LogWindows:Error: KERNELBASE.dll!0x00000000FD47A06D
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F483A3A
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F53058B
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F3B9E28
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F990088
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F99CE5C
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F977937
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F953D7F
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F99640E
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F99B960
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F9BB438
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F9BA489
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F981EA5
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F919E08
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000004032C133
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x00000000402E4FD6
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x00000000404D794E
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F3989C8
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F397FC2
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F39813A
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x000000003F3A91D8
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ChildActorCrash.exe!0x00000000430A247E
[2017.06.14-16.36.13:152][  0]LogWindows:Error: kernel32.dll!0x00000000773159CD
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ntdll.dll!0x000000007744A561
[2017.06.14-16.36.13:152][  0]LogWindows:Error: ntdll.dll!0x000000007744A561

Community References

Blueprint nativization produces a crashing build when adding child actor components with a class already set

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.16, 4.17
Target Fix	4.17

Fix Commit	3501457
Main Commit	3510073

Created	Jun 14, 2017
Resolved	Jun 20, 2017
Updated	Apr 27, 2018

UE-46054

Crash upon launching packaged game with nativized blueprints that include Add Child Actor Component node with a class already set

Crash upon launching packaged game with nativized blueprints that include Add Child Actor Component node with a class already set

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