From 7c2f2d9630c03e12623a6e8941e007ee0e273b3d Mon Sep 17 00:00:00 2001
From: ShadowNinja <shadowninja@minetest.net>
Date: Fri, 30 May 2014 20:58:32 -0400
Subject: [PATCH] Fix crash when trying to repair unknown items

---
 technic/machines/MV/tool_workshop.lua | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/technic/machines/MV/tool_workshop.lua b/technic/machines/MV/tool_workshop.lua
index b00c3bb..67a37e6 100644
--- a/technic/machines/MV/tool_workshop.lua
+++ b/technic/machines/MV/tool_workshop.lua
@@ -62,9 +62,12 @@ minetest.register_abm({
 
 		local repairable = false
 		local srcstack = inv:get_stack("src", 1)
-		if (not srcstack:is_empty("src")) then
+		if not srcstack:is_empty("src") then
 			local itemdef = minetest.registered_items[srcstack:get_name()]
-			if (itemdef.wear_represents or "mechanical_wear") == "mechanical_wear" and srcstack:get_wear() ~= 0 then
+			if itemdef and
+					itemdef.wear_represents and
+					itemdef.wear_represents == "mechanical_wear" and
+					srcstack:get_wear() ~= 0 then
 				repairable = true
 			end
 		end