diff --git a/mycaldav/models.py b/mycaldav/models.py
index c98b385..6c0af28 100644
--- a/mycaldav/models.py
+++ b/mycaldav/models.py
@@ -163,7 +163,7 @@ class cls_caldav():
 
     def convert_to_gmt1(self, dt):
         gmt1_tz = pytz.timezone('Europe/Paris')
-        if dt.tzinfo is not None:
+        if hasattr(dt,"tzinfo") and dt.tzinfo is not None:
             # Convertir l'objet datetime en GMT+1
               # Utilisez le nom de votre fuseau horaire GMT+1
             dt_gmt1 = dt.astimezone(gmt1_tz)
@@ -269,7 +269,7 @@ class cls_caldav_client():
 
     def init_caldav(self, caldav_url, caldav_user, caldav_password):
         client = caldav.DAVClient(url=caldav_url, username=caldav_user, password=caldav_password)
-        self.data = self.client.principal()
+        self.data = client.principal()
 
         for cal in self.data.calendars():
             print(f"name: {cal.name}({cal.url})")