Fix crash when entering a non-number for forcefield range

diff --git a/technic/machines/HV/forcefield.lua b/technic/machines/HV/forcefield.lua
index fe9c8ea1653de1158d6367e15a30dd66eb5fb0af..dd9f8ef6eb9485e592767759afc9b64ee944b387 100644 (file)
--- a/technic/machines/HV/forcefield.lua
+++ b/technic/machines/HV/forcefield.lua
@@ -68,7 +68,7 @@ end
 
 local forcefield_receive_fields = function(pos, formname, fields, sender)
        local meta = minetest.get_meta(pos)
-       local range = fields.range
+       local range = tonumber(fields.range) or 0
 
        if fields.toggle then
                if meta:get_int("enabled") == 1 then