From c3199a3d2b95b501aee757b15d8ce0c819f4bf74 Mon Sep 17 00:00:00 2001
From: Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Date: Wed, 10 Jun 2015 12:18:50 -0400
Subject: [PATCH] fix crash on invalid msg

---
 init.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init.lua b/init.lua
index 144353e..c2f3dbc 100644
--- a/init.lua
+++ b/init.lua
@@ -41,7 +41,7 @@ local on_digiline_receive = function(pos, node, channel, msg)
 	local meta = minetest.get_meta(pos)
 	local setchan = meta:get_string("channel")
 	if setchan ~= channel then return end
-	local num = tonumber(msg)
+	local num = tonumber(msg) or 0
 	if msg == "colon" or msg == "period" or msg == "off" or (num >= 0 and num <= 9) then
 		minetest.swap_node(pos, { name = "nixie_tubes:tube_"..msg, param2 = node.param2})
 	end