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Hello people of Lua town... or list, same thing. :-)

I'm using this function to retrieve Lua global 'BottomLayer' of type 'Image'. I try it but it returns a null pointer:

Image *Map::GetBottomLayer()
	lua_getglobal(Script, "BottomLayer");
	return (Image*)tolua_tousertype(Script, 1, 0);

I just grabbed the tolua_tousertype from the toLua binding of the Image class. I Googled a bit and the arguments seem alright... What am I doing wrong?

Thanks in advance!