diff --git a/internal.lua b/internal.lua
index 6449979..b49906e 100644
--- a/internal.lua
+++ b/internal.lua
@@ -332,7 +332,9 @@ function ui.apply_filter(player, filter, search_dir)
 			return true
 		end
 	else
-		local lang = minetest.get_player_information(player_name).lang_code
+		local player_info = minetest.get_player_information(player_name)
+		local lang = player_info and player_info.lang_code or ""
+
 		ffilter = function(name, def)
 			local lname = string.lower(name)
 			local ldesc = string.lower(def.description)
diff --git a/register.lua b/register.lua
index 387dbd5..8dc20f0 100644
--- a/register.lua
+++ b/register.lua
@@ -499,6 +499,14 @@ local function craftguide_craft(player, formname, fields)
 	local alternate = ui.alternate[player_name]
 
 	local craft = crafts[alternate]
+	if not craft.width then
+		if not craft.output then
+			minetest.log("warning", "[unified_inventory] Craft has no output.")
+		else
+			minetest.log("warning", ("[unified_inventory] Craft for '%s' has no width."):format(craft.output))
+		end
+		return
+	end
 	if craft.width > 3 then return end
 
 	ui.craftguide_match_craft(player, "main", "craft", craft, amount)