diff --git a/calendar/inc/class.calendar_so.inc.php b/calendar/inc/class.calendar_so.inc.php
index bbd41c16d5..b18dd5f26f 100644
--- a/calendar/inc/class.calendar_so.inc.php
+++ b/calendar/inc/class.calendar_so.inc.php
@@ -2328,7 +2328,7 @@ ORDER BY cal_user_type, cal_usre_id
 			}
 		}
 		//error_log(__METHOD__."(".array2string($cal_id).") returning ".array2string($alarms));
-		return $alarms;
+		return $alarms ? $alarms : array();
 	}
 
 	/**