Editor will crash during shutdown while a global Find-in-Blueprint tab is open and indexing is active.

The editor will crash during shutdown if Blueprints are actively being indexed in the background.

1. Launch UE4 editor (any project).
2. Choose Window->Find in Blueprint->Find in Blueprint 1.
3. While Blueprints are still being indexed, attempt to close/quit the editor.
4. A crash will result:

   Assertion failed: AssetRegistryPtr [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/AssetRegistry/Private/AssetRegistryModule.cpp] [Line: 33]
   

UE4Editor_Core!AssertFailedImplV() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:100]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:450]
UE4Editor_AssetRegistry!FAssetRegistryModule::Get() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\AssetRegistry\Private\AssetRegistryModule.cpp:33]
UE4Editor_Kismet!FCacheAllBlueprintsTickableObject::ShouldEnableMultiprocessing() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\Kismet\Private\FindInBlueprintManager.cpp:1584]
UE4Editor_Kismet!FAsyncSearchIndexTaskRunnable::Run() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\Kismet\Private\FindInBlueprintManager.cpp:1335]
UE4Editor_Core!FRunnableThreadWin::Run() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:86]