diff --git a/lib/migrations/DBSchemaVersion.php b/lib/migrations/DBSchemaVersion.php
index 846a544cae831252709702308189c9efaa13f9bf..4d61c0e1c0ef2f06ec2a1b2348871a6cfaf7ac3c 100644
--- a/lib/migrations/DBSchemaVersion.php
+++ b/lib/migrations/DBSchemaVersion.php
@@ -116,7 +116,7 @@ class DBSchemaVersion implements SchemaVersion
      */
     public function get($branch = 0)
     {
-        return $this->versions[$branch];
+        return $this->versions[$branch] ?? 0;
     }
 
     /**