From d7620f7cb90dffeb07e7442d6e38c1e69081086e Mon Sep 17 00:00:00 2001
From: Och Noe <och_noe@forksworld.de>
Date: Mon, 22 Oct 2018 23:00:57 +0200
Subject: http://linux-forks.de/moreblocks/71.html fixed

---
 circular_saw.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/circular_saw.lua b/circular_saw.lua
index b0a6d64..b0b039c 100644
--- a/circular_saw.lua
+++ b/circular_saw.lua
@@ -242,6 +242,9 @@ function circular_saw.allow_metadata_inventory_put(
 		local incost = (incount * 8) + microstack:get_count()
 		local maxcost = (stackmax * 8) + 7
 		local cost = circular_saw:get_cost(inv, stackname)
+		if not cost then 
+		   return 0 
+		end
 		if (incost + cost) > maxcost then
 			return math.max((maxcost - incost) / cost, 0)
 		end
-- 
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