Editor Crashes when compiling a 3d widget after adding array variable

Editor crashes when user adds array variable (any type) to a 3d widget that is used within a blueprint actor and then compiles the widget.

Frequency: 4/4

Crash Reporter: [Link Removed]

1. Open Editor (any project)
2. Create new Widget Blueprint
3. In Widget, set custom resolution to 500x500
4. Add text block
5. Compile, save widget blueprint
6. In content browser, create new actor blueprint
7. In actor blueprint, add widget component, set to new widget.
8. Compile, save, close actor BP, Add copy to level
9. In widget BP, Add variable, set to array, compile

MachineId:4E82586D46B558EA69EF0EAA821297B1
EpicAccountId:1558531203f84e81b70959b8a59badef

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Core + 129840 bytes
UE4Editor_CoreUObject + 402930 bytes
UE4Editor_CoreUObject + 956245 bytes
UE4Editor_CoreUObject + 401328 bytes
UE4Editor_CoreUObject + 988792 bytes
UE4Editor_CoreUObject + 927815 bytes
UE4Editor_CoreUObject + 552058 bytes
UE4Editor_CoreUObject + 377505 bytes
UE4Editor_UnrealEd + 9881778 bytes
UE4Editor_Kismet + 727159 bytes
UE4Editor_Kismet + 992849 bytes
UE4Editor_Kismet + 1007926 bytes
UE4Editor_Slate + 588774 bytes
UE4Editor_Slate + 1535133 bytes
UE4Editor_Slate + 1030727 bytes
UE4Editor_Slate + 1037049 bytes
UE4Editor_Slate + 1435577 bytes
UE4Editor_Slate + 2116506 bytes
UE4Editor_Slate + 2296435 bytes
UE4Editor_Slate + 432060 bytes
UE4Editor_Slate + 160583 bytes
UE4Editor_Slate + 832224 bytes
UE4Editor_Slate + 770598 bytes
UE4Editor_Core + 2484713 bytes
UE4Editor_Core + 2400763 bytes
UE4Editor_Core + 2489275 bytes
UE4Editor_Core + 2387186 bytes
user32 + 105425 bytes
user32 + 104666 bytes
UE4Editor_Core + 2490486 bytes
UE4Editor!FEngineLoop::Tick() + 3434 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2193]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]