diff --git a/calendar/inc/class.bocalendar.inc.php b/calendar/inc/class.bocalendar.inc.php
index 9f221379f1..5cc23fe905 100755
--- a/calendar/inc/class.bocalendar.inc.php
+++ b/calendar/inc/class.bocalendar.inc.php
@@ -828,7 +828,7 @@
 				}
 			}
       
-			if($id)
+			if(count($id) >= 1)
 			{
 				@reset($id);
 				$sql .= ' AND phpgw_cal.cal_id NOT IN ('.(count($id)==1?$id[0]:implode(',',$id)).')';