add nil checks to on_place

cavestuff/init.lua

@@ -1,5 +1,3 @@
-cavestuff = {}
-
 dofile(minetest.get_modpath("cavestuff").."/nodes.lua")
 dofile(minetest.get_modpath("cavestuff").."/mapgen.lua")
 

cavestuff/nodes.lua

@@ -155,5 +155,3 @@ minetest.register_node("cavestuff:stalactite_3",{
 		}
 	},
 })
-
---Stalagmites

dryplants/juncus.lua

@@ -46,6 +46,10 @@ minetest.register_node("dryplants:juncus", {
 		fixed = {-7/16, -1/2, -7/16, 7/16, 0, 7/16},
 	},
 	on_place = function(itemstack, placer, pointed_thing)
+		if not itemstack or not placer or not pointed_thing then
+			return
+		end
+
 		local playername = placer:get_player_name()
 		if minetest.is_protected(pointed_thing.above, playername) or
 			minetest.is_protected(pointed_thing.under, playername) then

pl_seaweed/init.lua

@@ -47,6 +47,10 @@ for i in ipairs(algae_list) do
 		liquids_pointable = true,
 		drop = "flowers:seaweed",
 		on_place = function(itemstack, placer, pointed_thing)
+			if not itemstack or not placer or not pointed_thing then
+				return
+			end
+
 			local keys = placer:get_player_control()
 			local pt = pointed_thing
 

pl_waterlilies/init.lua

@@ -59,6 +59,10 @@ for i in ipairs(lilies_list) do
 		liquids_pointable = true,
 		drop = "flowers:waterlily",
 		on_place = function(itemstack, placer, pointed_thing)
+			if not itemstack or not placer or not pointed_thing then
+				return
+			end
+
 			local keys = placer:get_player_control()
 			local pt = pointed_thing