diff --git a/akeneo_connector/akeneo_product.py b/akeneo_connector/akeneo_product.py
index dd0a1a0..4e45187 100644
--- a/akeneo_connector/akeneo_product.py
+++ b/akeneo_connector/akeneo_product.py
@@ -288,7 +288,12 @@ def set_value(self, attribute: str, locale: str | None = None, scope: str | None
         Returns:
             None
         """
-        # Failsafes
+        # Ensure self.values is properly initialized
+        if self.values is None:
+            self.values = {}
+            self.updated_values = {}
+
+        # Further processing
         if data is None:
             return
         
@@ -315,6 +320,7 @@ def set_value(self, attribute: str, locale: str | None = None, scope: str | None
                 'data': data
             })
 
+
     def get(self, identifier: str | None = None, with_attribute_options: bool = False):
         """
         Retrieves the product data.
@@ -365,7 +371,7 @@ def update(self):
             bool: JSON response if successful, None otherwise.
         """
         # Build the URL
-        url = self.connector.product_url.format(identifier=self.identifier)
+        url = self.connector.products_url
 
         # Update the product
         return self.connector.update(url, self.payload())