Editor Crashes when placing a widget blueprint from one widget blueprint into another via the user created section

CHANGELIST:
4.5.0-2316912
 
CRASHREPORT:
Did not produce an error report
 
CALLSTACK:
Did not produce an error report
 
DESCRIPTION:
  Editor Crashes when placing a widget blueprint from one widget blueprint into another via the user created section
 
IMPACT:
  Editor Crashing
 
 
FREQUENCY:
3/3
 
 
REPRO STEPS: [reproduced internally]
1.    Download attached Zip file
2.    Unzip and Run Unreal Engine project file
3.    Navigate: Content Broswer > Game > Blueprints> WidgetA
4.    Navigate: Content Broswer > Game > Blueprints> WidgetB
5.    In WidgetA Designer tab go to Palette (on the left)
6.    Scroll to the bottom untill you see User Created
7.     Expand User Created
8.    Drag WidgetB into WidgetA Designer graph
9.    Repeat Steps 5-8 for WidgetB
 
RESULTS:
  Editor with freeze and then after a few seconds it will crash
 
EXPECTED:
  WidgetA to be placed into the WidgetB Designer graph
  
 
ENVIRONMENT:
OS: Windows 7 Professional 64-bit
PROCESSOR:  Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz, ~2.1GHz
RAM: 32GB RAM
SOUND SETUP: Headphones
DIRECTX: DirectX 11
VIDEO CARD: NVIDIA GeForce GTX 770

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