diff --git a/UI/Scheduler/UIxCalListingActions.m b/UI/Scheduler/UIxCalListingActions.m
index 4b4a956c4..854537bd8 100644
--- a/UI/Scheduler/UIxCalListingActions.m
+++ b/UI/Scheduler/UIxCalListingActions.m
@@ -364,7 +364,10 @@ static NSArray *tasksFields = nil;
 		{
 		  // Identifies whether the active user is the organizer
 		  // of this event.
-		  if ([ownerUser hasEmail: [newInfo objectForKey: @"c_orgmail"]])
+		  NSString *c_orgmail;
+		  c_orgmail = [newInfo objectForKey: @"c_orgmail"];
+
+		  if ([c_orgmail isKindOfClass: [NSString class]] && [ownerUser hasEmail: c_orgmail])
                     [newInfo setObject: [NSNumber numberWithInt: 1]
                                 forKey: @"ownerIsOrganizer"];
                   else