Cannot pass NULL to Pointer<void>

[SimoneAncona]

I have this code in TypeScript:

sdl.SDL2.SDL_RenderCopy(renderer, texture, NULL, NULL); // NULL from ref.NULL

Where SDL_RenderCopy is binded here as

...
"SDL_RenderCopy": ["int", [SDL2_RendererPtr, SDL2_TexturePtr, SDL2_RectPtr, SDL2_RectPtr]],
...

For now I have defined the pointers all as Pointer<void>
I'm trying to pass NULL but I get this error:
TypeError: error setting argument 3 - writePointer: Buffer instance expected as third argument

I tried debugging the project and i found that NULL is seen as undefined