From ca55c135cdd5a0181d5d8ecf38b4075aab690556 Mon Sep 17 00:00:00 2001
From: hmczju <hmczju@gmail.com>
Date: Sun, 19 Mar 2017 03:01:27 +0800
Subject: [PATCH] Update Session.php

---
 library/think/Session.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/think/Session.php b/library/think/Session.php
index adf93441..ed0d0b57 100644
--- a/library/think/Session.php
+++ b/library/think/Session.php
@@ -56,7 +56,7 @@ class Session
             $isDoStart = true;
         }
 
-        if (isset($config['prefix']) && self::$prefix === '') {
+        if (isset($config['prefix']) && self::$prefix === '' && self::$prefix === null) {
             self::$prefix = $config['prefix'];
         }
         if (isset($config['var_session_id']) && isset($_REQUEST[$config['var_session_id']])) {