From 399d22550a19a65827c9c0b0c66ace506af71115 Mon Sep 17 00:00:00 2001
From: Vladimir Kartaviy <vkartaviy@gmail.com>
Date: Sat, 22 Sep 2012 01:18:53 +0300
Subject: [PATCH] #49 Fixed WsServer::getSubProtocolString method return value
 and related unit-test

---
 WsServer.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WsServer.php b/WsServer.php
index 144b914..4b2534c 100644
--- a/WsServer.php
+++ b/WsServer.php
@@ -208,7 +208,7 @@ class WsServer implements MessageComponentInterface {
             }
         }
 
-        return substr($string, 0, -1);
+        return substr($string, 0, -1) ?: '';
     }
 
     /**