diff --git a/ingredients/__init__.py b/ingredients/__init__.py
index 4d28b9c..e318c1b 100644
--- a/ingredients/__init__.py
+++ b/ingredients/__init__.py
@@ -39,7 +39,7 @@ def parse_ingredient_from_nlp(ingredients: List[str]) -> Ingredient:
             quantity=quantity,
             unit=unit,
             preparation=ingredient.preparation.text if ingredient.preparation else '',
-            product_id=0
+            product_id=-1
         ))
     
     return results
diff --git a/products/__init__.py b/products/__init__.py
index c1c48b3..86da4bb 100644
--- a/products/__init__.py
+++ b/products/__init__.py
@@ -17,7 +17,7 @@ def get_package_size(data: dict) -> str:
 
 async def create_product(link: str) -> Product:
     product_id = get_product_id(link)
-    if product_id < 0:
+    if not product_id:
         return None, None
     
     product_url = get_product_details_url(product_id)
@@ -55,7 +55,7 @@ async def add_missing_tags(conn, product: Product, tags: List[str]):
 
 async def get_or_create(conn, url: str, tags: List[str]) -> Product:
     product_id = get_product_id(url)
-    if product_id < 0:
+    if not product_id:
         return None
     
     existing = await find_product_by_product_id(conn, product_id)