Unreal Engine Issues and Bug Tracker (UE-43330)

Description

If a BP function contains a Create Event node, deleting the function will cause the editor to crash when modifying any custom event of that BP.

Regression:
No - same behavior occurs in 4.14.3 Binary

Steps to Reproduce

Open UE4 Editor (any project)
Add blueprint based on actor
Add Custom Event node
Add new function
Inside new function, add Create Event node
Delete new function
Select the Custom Event node and add a parameter

Result:
Editor crashes when parameter is added

Expected:
Parameter is added without crash

Callstack

LoginId:7156c35640f86204e61b8383f45dee17
EpicAccountId:e8c7fa630b6440f69a25a2c64d6c482c

Assertion failed: Result [File:D:\Workspaces\DWilson_Main\Engine\Source\Editor\UnrealEd\Private\Kismet2\BlueprintEditorUtils.cpp] [Line: 2165] 



UE4Editor_Core!FDebug::AssertFailed() [d:\workspaces\dwilson_main\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_UnrealEd!FBlueprintEditorUtils::FindBlueprintForGraphChecked() [d:\workspaces\dwilson_main\engine\source\editor\unrealed\private\kismet2\blueprinteditorutils.cpp:2166]
UE4Editor_BlueprintGraph!UK2Node_CreateDelegate::HandleAnyChangeWithoutNotifying() [d:\workspaces\dwilson_main\engine\source\editor\blueprintgraph\private\k2node_createdelegate.cpp:200]
UE4Editor_BlueprintGraph!UK2Node_CreateDelegate::HandleAnyChange() [d:\workspaces\dwilson_main\engine\source\editor\blueprintgraph\private\k2node_createdelegate.cpp:238]
UE4Editor_UnrealEd!FParamsChangedHelper::EditCreateDelegates() [d:\workspaces\dwilson_main\engine\source\editor\unrealed\private\kismet2\blueprinteditorutils.cpp:473]
UE4Editor_UnrealEd!FBasePinChangeHelper::Broadcast() [d:\workspaces\dwilson_main\engine\source\editor\unrealed\private\kismet2\blueprinteditorutils.cpp:404]
UE4Editor_Kismet!FBaseBlueprintGraphActionDetails::OnParamsChanged() [d:\workspaces\dwilson_main\engine\source\editor\kismet\private\blueprintdetailscustomization.cpp:3827]
UE4Editor_Kismet!FBaseBlueprintGraphActionDetails::OnAddNewInputClicked() [d:\workspaces\dwilson_main\engine\source\editor\kismet\private\blueprintdetailscustomization.cpp:4594]
UE4Editor_Kismet!TMemberFunctionCaller<FBlueprintGraphActionDetails,FReply (__cdecl FBlueprintGraphActionDetails::*)(void) __ptr64>::operator()<>() [d:\workspaces\dwilson_main\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
UE4Editor_Kismet!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<FBlueprintGraphActionDetails,FReply (__cdecl FBlueprintGraphActionDetails::*)(void) __ptr64> >() [d:\workspaces\dwilson_main\engine\source\runtime\core\public\templates\tuple.h:504]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintGraphActionDetails,0,FReply __cdecl(void)>::Execute() [d:\workspaces\dwilson_main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\workspaces\dwilson_main\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\workspaces\dwilson_main\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:278]
UE4Editor_Slate!<lambda_5625dc03d58301169f0608b0af9308e7>::operator()() [d:\workspaces\dwilson_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5031]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_5625dc03d58301169f0608b0af9308e7> >() [d:\workspaces\dwilson_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:239]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\workspaces\dwilson_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5020]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\workspaces\dwilson_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5498]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\workspaces\dwilson_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5478]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\workspaces\dwilson_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:1698]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\workspaces\dwilson_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:2120]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\workspaces\dwilson_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\workspaces\dwilson_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:714]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\workspaces\dwilson_main\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:980]
UE4Editor!FEngineLoop::Tick() [d:\workspaces\dwilson_main\engine\source\runtime\launch\private\launchengineloop.cpp:3018]
UE4Editor!GuardedMain() [d:\workspaces\dwilson_main\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\workspaces\dwilson_main\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\workspaces\dwilson_main\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.15.1, 4.16
Target Fix	4.16

Fix Commit	3376826
Main Commit	3380073

Created	Mar 24, 2017
Resolved	Apr 3, 2017
Updated	Apr 27, 2018

UE-43330

Crash when modifying BP custom event after deleting BP function

Crash when modifying BP custom event after deleting BP function

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