diff --git a/lib/member.php b/lib/member.php
index b2ee726c..92d2a0fc 100644
--- a/lib/member.php
+++ b/lib/member.php
@@ -122,7 +122,7 @@ class Member extends Db{
 	
 	public static function deleteBySessionId($esId){
 		$query = \OCP\DB::prepare('DELETE FROM ' . self::DB_TABLE . ' WHERE `es_id` = ?');
-		$query->execute($esId);
+		$query->execute(array($esId));
 	}
 	
 	protected static function getInactivityPeriod(){
diff --git a/lib/op.php b/lib/op.php
index e91ff97f..2ffa582a 100644
--- a/lib/op.php
+++ b/lib/op.php
@@ -89,7 +89,7 @@ class Op {
 	
 	public static function deleteBySessionId($esId){
 		$query = \OCP\DB::prepare('DELETE FROM ' . self::DB_TABLE . ' WHERE `es_id` = ?');
-		$query->execute($esId);
+		$query->execute(array($esId));
 	}
 
 	public static function removeCursor($esId, $memberId){
diff --git a/lib/session.php b/lib/session.php
index 2bcf1fbf..15a79778 100644
--- a/lib/session.php
+++ b/lib/session.php
@@ -127,7 +127,7 @@ class Session extends Db{
 	
 	public static function deleteByFileid($fileId){
 		$query = \OCP\DB::prepare('DELETE FROM ' . self::DB_TABLE . ' WHERE `file_id` = ?');
-		$query->execute($fileId);
+		$query->execute(array($fileId));
 	}
 
 	protected static function getUniqueSessionId(){