Extra error checking.

deco_plants.lua

@@ -1,5 +1,9 @@
 fun_caves.water_plants = {}
 local function register_water_plant(desc)
+	if not (desc and type(desc) == 'table') then
+		return
+	end
+
 	fun_caves.water_plants[#fun_caves.water_plants+1] = desc
 end
 
@@ -129,6 +133,10 @@ for _, plant in ipairs(fun_caves.plantlist) do
 			},
 			sounds = plant.sounds or default.node_sound_leaves_defaults(),
 			after_dig_node = function(pos, oldnode, oldmetadata, digger)
+				if not (pos and oldnode) then
+					return
+				end
+
 				local replacement = oldnode.name:gsub('.*_water_(.*)', 'default:%1')
 				if replacement:find('cloud$') then
 					replacement = replacement:gsub('^default', 'fun_caves')
@@ -151,6 +159,10 @@ end
 
 
 local function register_flower(name, seed, biomes)
+	if not (name and seed and biomes and type(name) == 'string' and type(seed) == 'number' and type(biomes) == 'table') then
+		return
+	end
+
 	local param = {
 		deco_type = "simple",
 		place_on = {"default:dirt_with_grass"},