diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 7fa4926..1d90539 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -1988,7 +1988,7 @@ class Event(models.Model):
             # check if the event has already be imported (using uuid)
             same_events = event.find_same_events_by_uuid()
 
-            if len(same_events) != 0:
+            if same_events is not None and len(same_events) != 0:
                 # check if one event has been imported and not modified in this list
                 same_imported = Event.find_last_pure_import(same_events)
                 pure = True