From fb01e619466d5e5147cd1609f45444667dab7d82 Mon Sep 17 00:00:00 2001
From: Elias Fleckenstein <eliasfleckenstein@web.de>
Date: Thu, 8 Jul 2021 15:31:27 +0200
Subject: [PATCH] Fix server crash when dispensing an unknown item This works
 similar to 2aafb2f2d01a6ece9ed4642a7081c53dbf22f773, however it is a cleaner
 way to do it.

---
 mods/ITEMS/REDSTONE/mcl_dispensers/init.lua | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua b/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua
index ee7f29016..7c2c07393 100644
--- a/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua
+++ b/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua
@@ -129,8 +129,13 @@ local dispenserdef = {
 					dropitem:set_count(1)
 					local stack_id = stacks[r].stackpos
 					local stackdef = stack:get_definition()
+
+					if not stackdef then
+						return
+					end
+					
 					local iname = stack:get_name()
-					local igroups = minetest.registered_items[iname].groups
+					local igroups = stackdef.groups
 
 					--[===[ Dispense item ]===]