diff --git a/ChangeLog b/ChangeLog
index 5d54c092d..5e85fa1fd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,9 @@
 	update the right event in the database in order to
 	update major properties coming from external invitations
 	during updates.
+	* SoObjects/Appointments/SOGoAppointmentObject.m (-PUTAction:)
+	We check if uid is not nil prior comparing it to the
+	owner. This fixes bug #1323
 
 2011-07-02  Ludovic Marcotte  <lmarcotte@inverse.ca>
 
diff --git a/SoObjects/Appointments/SOGoAppointmentObject.m b/SoObjects/Appointments/SOGoAppointmentObject.m
index d4e5f3ca8..932f952e0 100644
--- a/SoObjects/Appointments/SOGoAppointmentObject.m
+++ b/SoObjects/Appointments/SOGoAppointmentObject.m
@@ -1809,7 +1809,7 @@
 	  else
 	    uid = [[[[[newEvent parent] events] objectAtIndex: 0] organizer] uid];
 	  	  
-	  if ([uid caseInsensitiveCompare: owner] == NSOrderedSame)
+	  if (uid && [uid caseInsensitiveCompare: owner] == NSOrderedSame)
 	    {
 	      if ((ex = [self _handleUpdatedEvent: newEvent  fromOldEvent: oldEvent]))
 		return ex;