diff --git a/phpBB/phpbb/di/container_builder.php b/phpBB/phpbb/di/container_builder.php
index a314def0f3..ac1a1a1733 100644
--- a/phpBB/phpbb/di/container_builder.php
+++ b/phpBB/phpbb/di/container_builder.php
@@ -525,6 +525,11 @@ class container_builder
 	 */
 	protected function inject_dbal_driver()
 	{
+		if (empty($this->config_php_file))
+		{
+			return;
+		}
+
 		$config_data = $this->config_php_file->get_all();
 		if (!empty($config_data))
 		{