fix nil references in flowing_logic.lua

diff --git a/flowing_logic.lua b/flowing_logic.lua
index 011f0c337b9655c657876cc60f535c1425824573..cd1102d633b0025085fd1615daefa3c154a536b5 100644 (file)
--- a/flowing_logic.lua
+++ b/flowing_logic.lua
@@ -16,7 +16,7 @@ pipeworks_check_for_liquids = function(pos)
                {x=pos.x,y=pos.y,z=pos.z+1},    }
        for i =1,6 do
                local name = minetest.get_node(coords[i]).name
-               if string.find(name,"water") then
+               if name and string.find(name,"water") then
                        if finitewater then minetest.remove_node(coords[i]) end
                        return true
                end
@@ -37,7 +37,7 @@ pipeworks_check_for_inflows = function(pos,node)
        for i =1,6 do
                if newnode then break end
                local name = minetest.get_node(coords[i]).name
-               if (name == "pipeworks:pump_on" and pipeworks_check_for_liquids(coords[i])) or string.find(name,"_loaded") then
+               if name and (name == "pipeworks:pump_on" and pipeworks_check_for_liquids(coords[i])) or string.find(name,"_loaded") then
                        if string.find(name,"_loaded") then
                                local source = minetest.get_meta(coords[i]):get_string("source")
                                if source == minetest.pos_to_string(pos) then break end
@@ -57,7 +57,7 @@ pipeworks_check_sources = function(pos,node)
        if not sourcepos then return end
        local source = minetest.get_node(sourcepos).name
        local newnode = false
-       if not ((source == "pipeworks:pump_on" and pipeworks_check_for_liquids(sourcepos)) or string.find(source,"_loaded") or source == "ignore" ) then
+       if source and not ((source == "pipeworks:pump_on" and pipeworks_check_for_liquids(sourcepos)) or string.find(source,"_loaded") or source == "ignore" ) then
                newnode = string.gsub(node.name,"loaded","empty")
        end
 
@@ -69,7 +69,7 @@ end
 
 pipeworks_spigot_check = function(pos, node)
        local belowname = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z}).name
-       if belowname == "air" or belowname == "default:water_flowing" or belowname == "default:water_source" then 
+       if belowname and (belowname == "air" or belowname == "default:water_flowing" or belowname == "default:water_source") then 
                local spigotname = minetest.get_node(pos).name
                local fdir=node.param2
                local check = {
@@ -78,8 +78,9 @@ pipeworks_spigot_check = function(pos, node)
                        {x=pos.x,y=pos.y,z=pos.z-1},
                        {x=pos.x-1,y=pos.y,z=pos.z}
                }
-               if string.find(minetest.get_node(check[fdir+1]).name, "_loaded") then
-                       if spigotname == "pipeworks:spigot" then
+               local near_node = minetest.get_node(check[fdir+1])
+               if near_node and string.find(near_node.name, "_loaded") then
+                       if spigotname and spigotname == "pipeworks:spigot" then
                                minetest.add_node(pos,{name = "pipeworks:spigot_pouring", param2 = fdir})
                                if finitewater or belowname ~= "default:water_source" then
                                        minetest.add_node({x=pos.x,y=pos.y-1,z=pos.z},{name = "default:water_source"})