diff --git a/src/asquare.py b/src/asquare.py
index c172348..1059b98 100644
--- a/src/asquare.py
+++ b/src/asquare.py
@@ -103,7 +103,11 @@ async def acat2id(cat_id: str):
         {
             "id": obj["id"],
             "name": obj.get("item_data", {}).get("name", "Unknown"),
-            "number": get_set_number(obj.get("item_data", {}).get("name", ""))
+            "number": None if not obj.get("item_data", {}).get("name", "") else (
+                get_set_number(obj.get("item_data", {}).get("name", "")) 
+                if re.findall(r"\d{5}", obj.get("item_data", {}).get("name", "")) 
+                else None
+            )
         }
         for obj in result_json.get("objects", [])
     ]