diff --git a/src/Core/StorageManager.php b/src/Core/StorageManager.php
index 0a8b35ce2..4b74035ee 100644
--- a/src/Core/StorageManager.php
+++ b/src/Core/StorageManager.php
@@ -29,7 +29,8 @@ class StorageManager
 	}
 
 	/**
-	 * @brief Return current storage backend class
+	 * @brief Return current storage backend class 
+	 * 
 	 * @return string
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
@@ -52,6 +53,7 @@ class StorageManager
 
 	/**
 	 * @brief Set current storage backend class
+	 * If $class is an empty string, legacy db storage is used.
 	 *
 	 * @param string $class Backend class name
 	 * @return bool
@@ -59,7 +61,7 @@ class StorageManager
 	 */
 	public static function setBackend($class)
 	{
-		if (!in_array('Friendica\Model\Storage\IStorage', class_implements($class))) {
+		if ($class !== "" && !in_array('Friendica\Model\Storage\IStorage', class_implements($class))) {
 			return false;
 		}