How to get TMap pair's value?

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My code crashes using this method…
My map contains the structures inside (TMap&ltint32, FMyStruct>). And FMyStruct has int32 and FString fields.

My method _IterateStruct iterates by all types (include TArray, all basic types and UStructs).
But I also want to add TMap to this list.

if (UMapProperty* Prop = Cast<UMapProperty>(Property))
{
	void* ptr = Prop->ContainerPtrToValuePtr<void>(StructPtr);
	FScriptMapHelper ScriptMapHelper(Prop, ptr);
	const int32 ElementCount = ScriptMapHelper.Num();
	TArray<FString> keys;
	TArray<FString> values;
	for (int32 j = 0; j < ElementCount; ++j)
	{
		if (!ScriptMapHelper.IsValidIndex(j))
			continue;

		const uint8* MapPairPtr = ScriptMapHelper.GetPairPtr(j);
		result = _ParseObject(Prop->KeyProp, (void*)(MapPairPtr + Prop->MapLayout.KeyOffset));
		keys.Add(result);
		result = _ParseObject(Prop->ValueProp, (void*)(MapPairPtr + Prop->MapLayout.ValueOffset));
		values.Add(result);
	}
	result = FString::Printf(TEXT("\"%s\": [[%s], [%s]]"), *child->GetName(), *FString::Join(keys, TEXT(", ")), *FString::Join(values, TEXT(", ")));
}

And got crash in gathring FString data. Can I show my code for revision?