diff --git a/src/Sql/SqlBase.php b/src/Sql/SqlBase.php
index 36bf02627a..39a03a5536 100644
--- a/src/Sql/SqlBase.php
+++ b/src/Sql/SqlBase.php
@@ -111,6 +111,7 @@ public static function getInstance($db_spec, $options): ?self
             $instance->setConfig(Drush::config());
             return $instance;
         }
+        return null;
     }
 
     /*