The problem with packaged builds is that it dereferences GEngine->WireframeMaterial, which is NULL after packaging the game without editor support. You can fix the problem by checking if WITH_EDITOR is true before dereferencing WireframeMaterial.
You can see the fix I made to my similar primitive component implementation here: https://.com/AndrewScheidecker/BrickGame/commit/767adc91a7881f149e9488df7b691e354b36728a