IPropertyHandle SetValue causes entire property window to disappear

Development Programming & Scripting C++
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1

I have a custom UStruct that just looks like this:

#pragma once

#include "LocomotionSelectionData.generated.h"

USTRUCT()
struct FLocomotionSelectionData
{
	GENERATED_BODY()

	//UPROPERTY(VisibleInstanceOnly)
	//TArray<FString>											Names;

	UPROPERTY(VisibleInstanceOnly)
	FString													Selected;

};

I then have a IPropertyTypeCustomization for customizing this structure and I get the IPropertyHandle for this property by doing this in CustomizerHeader:

uint32 NumChildren;
	StructPropertyHandle->GetNumChildren(NumChildren);

	for (uint32 ChildIndex = 0; ChildIndex < NumChildren; ++ChildIndex)
	{
		const TSharedRef< IPropertyHandle > ChildHandle = StructPropertyHandle->GetChildHandle(ChildIndex).ToSharedRef();

		if (ChildHandle->GetProperty()->GetName() == TEXT("Selected"))
		{
			SelectedPropertyHandle = ChildHandle;
		}
	

	}

The problem is that as soon as I do this:

SelectedPropertyHandle->SetValue(FString("AAAAH"));

The entire property window disappears. Why is this happening?