diff --git a/calendar/inc/class.calendar_uiforms.inc.php b/calendar/inc/class.calendar_uiforms.inc.php
index 5d7e896196..3f6c3f5c80 100644
--- a/calendar/inc/class.calendar_uiforms.inc.php
+++ b/calendar/inc/class.calendar_uiforms.inc.php
@@ -378,7 +378,7 @@ class calendar_uiforms extends calendar_ui
 							{
 								$uid = false;	// entry has been deleted
 							}
-							else
+							elseif ($uid)
 							{
 								if (is_numeric($uid))
 								{