diff --git a/addons/google_calendar/google_calendar.py b/addons/google_calendar/google_calendar.py
index 0616a87d331..a20143aff85 100644
--- a/addons/google_calendar/google_calendar.py
+++ b/addons/google_calendar/google_calendar.py
@@ -84,8 +84,8 @@ class SyncEvent(object):
 
     def compute_OP(self, modeFull=True):
         #If event are already in Gmail and in OpenERP
-        is_owner = self.OE.event.env.user.id == self.OE.event.user_id.id
         if self.OE.found and self.GG.found:
+            is_owner = self.OE.event.env.user.id == self.OE.event.user_id.id
             #If the event has been deleted from one side, we delete on other side !
             if self.OE.status != self.GG.status and is_owner:
                 self.OP = Delete((self.OE.status and "OE") or (self.GG.status and "GG"),