diff --git a/scrapy/contrib/item/models.py b/scrapy/contrib/item/models.py
index 9be21cc93..f172d808a 100644
--- a/scrapy/contrib/item/models.py
+++ b/scrapy/contrib/item/models.py
@@ -196,8 +196,7 @@ class RobustScrapedItem(ScrapedItem):
 
     def validate(self):
         """Method used to validate item attributes data"""
-        if not self.guid:
-            raise ValidationError('A guid is required')
+        raise NotImplemented
 
     @property
     def version(self):