Crash with FBX with LODs when distance fields and Generated Lightmaps are enabled

DESCRIPTION: When importing a mesh with 1 or more additional LODs when Generate Mesh Distance Fields has been enabled via the Project settings will cause a crash if the import options include using the option to "Generate Lightmap UVs."

ATTACHED: Mesh with 3 LODs, Logs and DMP files

ENVIRONMENT:
OS: Windows 8.1
PROCESSOR: Intel(R) Xeon(R) CPU E5-2620 @ 2.10GHz
MEMORY: 32GB RAM
GRAPHICS: NVIDIA GeForce GTX 770

FREQUENCY: 3/3
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REPRO STEPS:

1. Open UE4
2. enabled Generate Distance Fields in Project Settings > Rendering
3. Close and Re-Open UE4
4. Import a mesh with 1 or more additional LODs
5. Import Options: Enable import LODs
6. Click Import

Expected: When importing Mesh with multiple loads the editor will not crash.

RESULTS: If generate lightmap UVs is left checked while Generate Distance Fields is enabled in editor project settings this will cause the editor to crash.

Work around: Disable Generate Lightmap UVs or manually import LODs for the mesh