From 26042494f9913dfb9ccb318357323d37bcad42c4 Mon Sep 17 00:00:00 2001
From: Tien <nhantien2806@gmail.com>
Date: Thu, 2 Jan 2020 13:44:07 -0500
Subject: [PATCH] minor fix

---
 src/Scrypt.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Scrypt.php b/src/Scrypt.php
index 5e723f7..8d16774 100644
--- a/src/Scrypt.php
+++ b/src/Scrypt.php
@@ -24,7 +24,7 @@ public function __construct($builder)
     {
         parent::__construct('SCRYPT', 0, 8, $builder);
 
-        if (!is_null($builder->getKey()) || strlen($builder->getKey()) === 0) {
+        if (is_null($builder->getKey()) || strlen($builder->getKey()) === 0) {
             throw new \InvalidArgumentException('A non-empty key is required for Scrypt');
         }