diff --git a/lib/private/db/adapter.php b/lib/private/db/adapter.php
index d0641f113f3c53020231e2e7c70a4c475b4e3e2c..de7b04c74db97d534d0874203136a736ec79c683 100644
--- a/lib/private/db/adapter.php
+++ b/lib/private/db/adapter.php
@@ -50,7 +50,7 @@ class Adapter {
 	 * @throws \Doctrine\DBAL\DBALException
 	 */
 	public function insertIfNotExist($table, $input, array $compare = null) {
-		if ($compare === null) {
+		if (empty($compare)) {
 			$compare = array_keys($input);
 		}
 		$query = 'INSERT INTO `' .$table . '` (`'
diff --git a/lib/private/db/adaptersqlite.php b/lib/private/db/adaptersqlite.php
index 1528285e11a7b05dfc84786787b9b4f77377c8f6..31f88940f0b1bd1d3bf3b8634c8630240ec12ecf 100644
--- a/lib/private/db/adaptersqlite.php
+++ b/lib/private/db/adaptersqlite.php
@@ -29,7 +29,7 @@ class AdapterSqlite extends Adapter {
 	 * @throws \Doctrine\DBAL\DBALException
 	 */
 	public function insertIfNotExist($table, $input, array $compare = null) {
-		if ($compare === null) {
+		if (empty($compare)) {
 			$compare = array_keys($input);
 		}
 		$fieldList = '`' . implode('`,`', array_keys($input)) . '`';