Frequent crash building lighting after sculpting landscape

Frequent crash occurs once when building lighting after editing a landscape. I added components to the landscape, sculpted, and flattened it.

I wasn't able to reproduce the issue again, so the above repro is what I was doing leading up to the crash.

1. Open QAGame in editor.
2. In the Modes panel, click the Landscape tab.
3. Click Create.
4. In the Modes panel, select the Place tab.
5. Select the Floor mesh in the level and delete it.
6. Select the Landscape tab again.
7. Click Manage and select the Add tool.
8. Add some components to the edges of the landscape (move your cursor to the edge of the landscape and left-click).
9. Click Sculpt.
10. Raise some of the terrain on the landscape (left-click and drag across the landscape).
11. Select the Flatten tool again.
12. Flatten some of the terrain (left-click and drag across the landscape).
13. Click the dropdown next to Build and select Build Lighting Only.

RESULT

Crash

UE4Editor_Engine!FShaderCompilingManager::PropagateMaterialChangesToPrimitives() shadercompiler.cpp:1910
UE4Editor_Engine!FShaderCompilingManager::ProcessCompiledShaderMaps() shadercompiler.cpp:1874
UE4Editor_Engine!FShaderCompilingManager::ProcessAsyncResults() shadercompiler.cpp:2328
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:3028
UE4Editor!GuardedMain() launch.cpp:166
UE4Editor!GuardedMainWrapper() launchwindows.cpp:130
UE4Editor!WinMain() launchwindows.cpp:206
UE4Editor!__scrt_common_main_seh() exe_common.inl:264
kernel32!<Unknown>
ntdll!<Unknown>

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