diff --git a/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua b/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua
index b6d0d2ef..4e8b2d2e 100644
--- a/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua
+++ b/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua
@@ -129,6 +129,19 @@ local dispenserdef = {
 				local stack_id = stacks[r].stackpos
 				local stackdef = stack:get_definition()
 				local iname = stack:get_name()
+				if not minetest.registered_items[iname] then
+					minetest.log(
+						"warning",
+						"Trying to dispense unknown item " ..
+						"“" .. iname .. "” " ..
+						"near (" ..
+						pos.x .. ", " ..
+						pos.y .. ", " ..
+						pos.z ..
+						")"
+					)
+					return
+				end
 				local igroups = minetest.registered_items[iname].groups
 
 				--[===[ Dispense item ]===]