Back ground blur causes crash on iphone 5

Back ground blur causes crash on iphone 5 (NOT iPhone5 c or iPhone5 s )

1. Download attached project
2. Open project
3. Package for iOS
4. Install the packaged ipa to an iPhone 5 (NOT iPhone5 c or iPhone5 s )
5. Open the app
6. Click the button that says "Test"
7. Notice that the app closes

Expected: The Screen would blur slightly
Result: The App closes when setting the blur for the background blur

Fix UE-51650

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