Unreal Engine Issues and Bug Tracker (UE-46616)

Description

there is a crash that occurs with gameplay tag map variable compiles with default value changed. This issue occurs no matter what the secondary value of the map is. I was unable to test this issue in 4.15 because the map with Gameplay Tag variable did not allow me to add a tag when I added an element, only the value.

Tested on
4.16.1 - CL 3466753
4.17 - CL 3505911

Steps to Reproduce

Create a new project (no template or starter content needed)
Click the project settings option and click the Gameplay tags option
Check the box that says "Import Tags from Config"
Click the option "Add New Gameplay Tag"
In the name option type "Gameplay.Tag.Test" then click the "Add New Tag" button
Close the project settings tab
Create a new actor class blueprint > Name it "Actor_BP" > Open Actor_BP
Add a new variable of type Gameplay Tag > Name it "TestMap"
Change the variable type to Map
Compile the blueprint
Add a map element to TestMap
Set the Key to Gameplay > Tag > Test
Set the value to 50
Compile the blueprint
Result: The editor crashes
Expected Result: The editor should compile the blueprint

Callstack

Assertion failed: CanWriteValueWithoutIdentifier() [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Json\Public\Serialization/JsonWriter.h] [Line: 151] 



UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_Kismet!TJsonWriter<wchar_t,TCondensedJsonPrintPolicy<wchar_t> >::WriteValue() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\json\public\serialization\jsonwriter.h:152]
UE4Editor_Kismet!FJsonSerializer::Serialize<wchar_t,TCondensedJsonPrintPolicy<wchar_t> >() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\json\public\serialization\jsonserializer.h:303]
UE4Editor_Kismet!FJsonSerializer::Serialize<wchar_t,TCondensedJsonPrintPolicy<wchar_t> >() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\json\public\serialization\jsonserializer.h:103]
UE4Editor_Kismet!BlueprintSearchMetaDataHelpers::SaveVariableDescriptionToJson() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\kismet\private\findinblueprintmanager.cpp:680]
UE4Editor_Kismet!FFindInBlueprintSearchManager::GatherBlueprintSearchMetadata() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\kismet\private\findinblueprintmanager.cpp:1626]
UE4Editor_Kismet!FFindInBlueprintSearchManager::AddOrUpdateBlueprintSearchMetadata() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\kismet\private\findinblueprintmanager.cpp:1750]
UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\kismet2\kismet2.cpp:783]
UE4Editor_Kismet!FBlueprintEditor::Compile() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\kismet\private\blueprinteditor.cpp:3292]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:434]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
UE4Editor_Slate!SToolBarButtonBlock::OnClicked() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:305]
UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64>::operator()<>() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64> >() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\templates\tuple.h:497]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:278]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5049]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:239]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5038]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5515]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5495]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1704]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:714]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3058]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build\++ue4+release-4.16+compile\sync\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 - Gameplay - Blueprint
Affects Versions	4.16.1, 4.17
Target Fix	4.17

Fix Commit	3521195
Main Commit	3555226
Release Commit	3521195

Created	Jun 28, 2017
Resolved	Jul 5, 2017
Updated	Apr 27, 2018

View Jira Issue

UE-46616

Crash occurs with gameplay tag map variable compiles with default value changed

Crash occurs with gameplay tag map variable compiles with default value changed

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