diff --git a/lemarche/conversations/factories.py b/lemarche/conversations/factories.py
index 24014abb4..1b8c073fe 100644
--- a/lemarche/conversations/factories.py
+++ b/lemarche/conversations/factories.py
@@ -20,6 +20,7 @@ class Meta:
 class EmailGroupFactory(DjangoModelFactory):
     class Meta:
         model = EmailGroup
+        skip_postgeneration_save = True  # To avoid error "duplicate key" when saving TemplateTransactional factory
 
     display_name = factory.Faker("name", locale="fr_FR")
     description = factory.Faker("name", locale="fr_FR")