diff --git a/lib/crypt.mjs b/lib/crypt.mjs
index 764b359..f3b906f 100644
--- a/lib/crypt.mjs
+++ b/lib/crypt.mjs
@@ -39,7 +39,7 @@ export function decryptPersonalKey (ekey, personaltoken) {
   // Extract password and seed from personal token
   const data = decodePersonalToken(personaltoken)
 
-  const hash = crypto.pbkdf2Sync(data.password, data.seed || Config.get().master_key, 12, 32, 'sha256')
+  const hash = crypto.pbkdf2Sync(data.password, data.seed.length ? data.seed : Config.get().master_key, 12, 32, 'sha256')
 
   // Clear the data buffers
   data.password.fill(0)