Crash when clicking on a "Two Bone IK" node

Crash when clicking on a "Two Bone IK" node in an Animation Blueprint

Crash Reporter currently down, see callstack section.

Log and dmp are attached

1. Open Content Examples
2. Find the Owen_IKAnimBlueprint
3. Open it
4. Click on either of the "Two Bone IK" nodes

Result: Crash after a long freeze

MachineId:BD5F477946ABC86E1167AEA503FBEFCC
EpicAccountId:6d468bd698bf4242961863e231283591

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

Assertion failed: ResultString.Num() == 3 [Link Removed] [Line: 298]

KERNELBASE + 37901 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() + 248 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() + 1079 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor_AnimGraph!UAnimGraphNode_SkeletalControlBase::GetDefaultValue() + 428 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\animgraph\private\animgraphnode_skeletalcontrolbase.cpp:298]
UE4Editor_AnimGraph!UAnimGraphNode_TwoBoneIK::CopyNodeDataTo() + 133 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\animgraph\private\animgraphnode_twoboneik.cpp:122]
UE4Editor_Persona!FAnimationViewportClient::FindSelectedAnimGraphNode() + 1098 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\persona\private\animationeditorviewportclient.cpp:674]
UE4Editor_Persona!FAnimationViewportClient::Tick() + 665 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\persona\private\animationeditorviewportclient.cpp:805]
UE4Editor_UnrealEd!UEditorEngine::Tick() + 6478 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editor.cpp:1389]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() + 22 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\unrealedengine.cpp:347]
UE4Editor!FEngineLoop::Tick() + 4179 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2257]
UE4Editor!GuardedMain() + 1404 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]