diff --git a/code/game/objects/items/stacks/stack.dm b/code/game/objects/items/stacks/stack.dm
index 8d617c29117..a7b365b3e29 100644
--- a/code/game/objects/items/stacks/stack.dm
+++ b/code/game/objects/items/stacks/stack.dm
@@ -475,12 +475,13 @@
 
 		if(isstack(created))
 			var/obj/item/stack/crafted_stack = created
-			if(recipe.res_amount > 0 && recipe.req_amount != recipe.res_amount)
-				var/scale = recipe.req_amount / recipe.res_amount
-				for(var/mat in result_mats)
-					result_mats[mat] *= scale
-			crafted_stack.mats_per_unit = SSmaterials.get_material_set_cache(result_mats)
-			crafted_stack.update_custom_materials()
+			if(crafted_stack.amount) // If our stack's been emptied, it means another stack's already eaten it, and that stack'll deal with materials
+				if(recipe.res_amount > 0 && recipe.req_amount != recipe.res_amount)
+					var/scale = recipe.req_amount / recipe.res_amount
+					for(var/mat in result_mats)
+						result_mats[mat] *= scale
+				crafted_stack.mats_per_unit = SSmaterials.get_material_set_cache(result_mats)
+				crafted_stack.update_custom_materials()
 		else
 			created.set_custom_materials(result_mats, recipe.req_amount * multiplier)