{
	groups = {
		not_in_creative_inventory = 1
	},
	drawtype = "airlike",
	drop = "",
	mod_origin = "*builtin*",
	air_equivalent = true,
	paramtype = "light",
	description = "Air (you hacker you!)",
	inventory_image = "air.png",
	floodable = true,
	pointable = false,
	sunlight_propagates = true,
	walkable = false,
	diggable = false,
	type = "node",
	buildable_to = true,
	name = "air",
	wield_image = "air.png"
}
2017-04-01 19:01:47: ERROR[Main]: ServerError: AsyncErr: ServerThread::run Lua: Runtime error from mod 'mobs_monster' in callback luaentity_Step(): /home/markus/.minetest/mods/pathfinder/init.lua:132: attempt to index upvalue 'walkable' (a function value)