diff --git a/src/TokenConfigStorage.php b/src/TokenConfigStorage.php
index 4da83ad..009d5bc 100644
--- a/src/TokenConfigStorage.php
+++ b/src/TokenConfigStorage.php
@@ -62,7 +62,7 @@ public function delete($email)
         ]);
 
         $gmailConfig->setState([
-            "token_for_{$email}" => '',
+            "token_for_{$email}" => [],
         ]);
 
         $this->configRepo->update($gmailConfig);