diff --git a/phpBB/includes/config/config.php b/phpBB/includes/config/config.php
index ff352abe84..4ba05a98ec 100644
--- a/phpBB/includes/config/config.php
+++ b/phpBB/includes/config/config.php
@@ -113,11 +113,6 @@ class phpbb_config implements ArrayAccess, IteratorAggregate, Countable
 	*/
 	public function delete($key, $cache = true)
 	{
-		if (!isset($this->config[$key]))
-		{
-			return;
-		}
-
 		unset($this->config[$key]);
 	}
 
diff --git a/phpBB/includes/config/db.php b/phpBB/includes/config/db.php
index caa2cff7f1..f98056e013 100644
--- a/phpBB/includes/config/db.php
+++ b/phpBB/includes/config/db.php
@@ -100,11 +100,6 @@ class phpbb_config_db extends phpbb_config
 	*/
 	public function delete($key, $cache = true)
 	{
-		if (!isset($this->config[$key]))
-		{
-			return;
-		}
-
 		$sql = 'DELETE FROM ' . $this->table . "
 			WHERE config_name = '" . $this->db->sql_escape($key) . "'";
 		$this->db->sql_query($sql);