From b84ed21fac6a3e4ea0724a035bc4726560143ee7 Mon Sep 17 00:00:00 2001
From: adrido <addi@king-arthur.eu>
Date: Wed, 5 Aug 2015 20:28:23 +0200
Subject: [PATCH] fix crash during incorrect call of `on_dig` without 2nd 3rd
 argument

---
 functions.lua | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/functions.lua b/functions.lua
index aae04d2..2a745df 100644
--- a/functions.lua
+++ b/functions.lua
@@ -177,6 +177,12 @@ cannons.stand_on_rightclick = function(pos, node, player, itemstack, pointed_thi
 end
 
 cannons.dug = function(pos, node, digger)
+	if not node or not type(node)=="table" then
+	  return
+	end
+	if not digger or not digger:is_player() then
+	  return
+	end
 	local cannons = minetest.registered_nodes[node.name].cannons
 	if cannons and cannons.stand and cannons.cannon then --node dug
 		node.name = cannons.stand