diff --git a/UI/Scheduler/UIxAppointmentEditor.m b/UI/Scheduler/UIxAppointmentEditor.m
index 1731f3810..5ef8e8e79 100644
--- a/UI/Scheduler/UIxAppointmentEditor.m
+++ b/UI/Scheduler/UIxAppointmentEditor.m
@@ -850,7 +850,7 @@
   attachUrls = [self attachUrls];
   if ([attachUrls count]) [data setObject: attachUrls forKey: @"attachUrls"];
 
-  if (!isAllDay)
+  if (!isAllDay && eventStartDate && eventStartDate)
     {
       [data setObject: [dateFormatter formattedTime: eventStartDate] forKey: @"localizedStartTime"];
       [data setObject: [dateFormatter formattedTime: eventEndDate] forKey: @"localizedEndTime"];