reraise the exception

program/models.py

@@ -99,8 +99,6 @@ class Speaker(CreatedUpdatedModel):
     camp = models.ForeignKey('camps.Camp', null=True, related_name="speakers")
     events = models.ManyToManyField(
         Event,
-        related_name='speakers',
-        related_query_name='speaker',
         blank=True,
     )
 

utils/models.py

@@ -17,8 +17,8 @@ class CleanedModel(models.Model):
             if hasattr(self, 'request'):
                 messages.error(self.request, message)
             print(message)
-            # dont save, just return
-            return
+            # dont save, re-raise the exception
+            raise
         super(CleanedModel, self).save(**kwargs)