Clicking the tutorial button in the Blueprint editor while the tutorial alert in the main editor is still displayed will crash the editor

Clicking the tutorial button in the Blueprint editor while the tutorial alert in the main editor is still displayed will crash the editor.

Reproduced in 4.8.1 and Main (//depot/UE4/Promoted-CL-2605171)

Crash Report:
[Link Removed]

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

UE4Editor_CoreUObject!UObjectBaseUtility::IsA() uobjectbaseutility.cpp:257
UE4Editor_SlateRHIRenderer!FSlateRHIResourceManager::GetShaderResource() slaterhiresourcemanager.cpp:385
UE4Editor_SlateCore!FSlateElementBatcher::AddBoxElement() elementbatcher.cpp:252
UE4Editor_SlateCore!FSlateElementBatcher::AddElements() elementbatcher.cpp:118
UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_Private() slaterhirenderer.cpp:588
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() slateapplication.cpp:1206
UE4Editor_Slate!FSlateApplication::DrawWindows() slateapplication.cpp:941
UE4Editor_Slate!FSlateApplication::Tick() slateapplication.cpp:1440
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2392
UE4Editor!GuardedMain() launch.cpp:142
UE4Editor!GuardedMainWrapper() launchwindows.cpp:126
UE4Editor!WinMain() launchwindows.cpp:200

1. Open the editor with -TestTutorialAlerts -ResetTutorials to ensure editor tutorial alerts are enabled
2. Do not close the tutorial alert in the main editor window
3. Open any Blueprint (or create a new one)
4. Click the tutorial button in the Blueprint editor

Result:
Crash

Fix UE-51650

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