diff --git a/src/Model/Table/AuthKeysTable.php b/src/Model/Table/AuthKeysTable.php
index f20299e1..b7968b02 100644
--- a/src/Model/Table/AuthKeysTable.php
+++ b/src/Model/Table/AuthKeysTable.php
@@ -29,7 +29,7 @@ public function initialize(array $config): void
     public function beforeMarshal(EventInterface $event, ArrayObject $data, ArrayObject $options)
     {
         $data['created'] = time();
-        if (!isset($data['expiration'])) {
+        if (!isset($data['expiration']) || empty($data['expiration'])) {
             $data['expiration'] = 0;
         } else {
             $data['expiration'] = strtotime($data['expiration']);