PVS-Studio warning V595 for UnrealEngine4

/**
 * Global engine pointer.
 * Can be 0 so don't use without checking.
 */
ENGINE_API UEngine* GEngine = NULL;

bool UEngine::LoadMap( FWorldContext& WorldContext,
  FURL URL, class UPendingNetGame* Pending, FString& Error )
{
  ....
  if (GEngine->GameViewport != NULL)
  {
    ClearDebugDisplayProperties();
  }

  if( GEngine )
  {
    GEngine->WorldDestroyed( WorldContext.World() );
  }
  ....
}

This suspicious code was found in UnrealEngine4 project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'GEngine' pointer was utilized before it was verified against nullptr. Check lines: 9714, 9719. unrealengine.cpp 9714

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