From d4819fc13ea7e6e49cc05a92b308c978c7d2f0f1 Mon Sep 17 00:00:00 2001
From: PilzAdam <adam-k@outlook.com>
Date: Sat, 29 Sep 2012 15:29:10 +0200
Subject: [PATCH] Make the code more stable

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

diff --git a/api.lua b/api.lua
index 8c90ced..05875d9 100644
--- a/api.lua
+++ b/api.lua
@@ -95,7 +95,7 @@ function mobs:register_mob(name, def)
 			end
 			
 			local do_env_damage = function(self)
-				if self.light_damage and self.light_damage ~= 0 and self.object:getpos().y>0 and minetest.env:get_node_light(self.object:getpos()) > 3 then
+				if self.light_damage and self.light_damage ~= 0 and self.object:getpos().y>0 and minetest.env:get_node_light(self.object:getpos()) and minetest.env:get_node_light(self.object:getpos()) > 3 then
 					self.object:punch(self.object, 1.0, {
 						full_punch_interval=1.0,
 						groupcaps={