diff --git a/app/services/pricing.py b/app/services/pricing.py
index 52412a0..72d4911 100644
--- a/app/services/pricing.py
+++ b/app/services/pricing.py
@@ -299,8 +299,13 @@ class PricingService:
                 .all()
             }
 
-            # Map the ids using the dictionary
-            df['product_id'] = df['tcgplayer_id'].map(product_id_mapping)
+            # Map tcgplayer_id to product_id, ensure strings, keep None if not found
+            df['product_id'] = df['tcgplayer_id'].map(product_id_mapping).apply(lambda x: str(x) if pd.notnull(x) else None)
+
+            # Log any tcgplayer_ids that didn't map to a product_id
+            null_product_ids = df[df['product_id'].isnull()]['tcgplayer_id'].tolist()
+            if null_product_ids:
+                logger.warning(f"The following tcgplayer_ids could not be mapped to a product_id: {null_product_ids}")
         
         price_lookup = self.get_all_prices_for_products(df['product_id'].unique())