Fixed exception in on_tick after well was removed. #44

control.lua

@@ -2,6 +2,7 @@ require "util"
 require "locale/utils/event"
 require "config"
 require "locale/utils/utils"
+require "locale/utils/list_utils"
 require "base_data"
 require "user_groups"
 require "chatlog"

on_tick.lua

@@ -1,6 +1,10 @@
 function refill_well()
     for _,well in pairs(global.wells) do
+      if well.chest.valid then
         well.chest.insert({name = well.item, count = well.items_per_second * 15})
+      else
+        table.remove_element(global.wells, well)
+      end
     end
 end