From 7acf12b2e6b574ff9ad660624e46888a095411b3 Mon Sep 17 00:00:00 2001
From: Xujian Chen <xchenxujian@gmail.com>
Date: Thu, 2 Jun 2016 18:04:51 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E6=97=A0=E6=B3=95=E4=BD=BF?=
 =?UTF-8?q?=E7=94=A8=E8=87=AA=E5=AE=9A=E4=B9=89=20Provider=20=E9=97=AE?=
 =?UTF-8?q?=E9=A2=98=20(#12)?=
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使用自定义 Provider 时，因 initialDrivers 无相应的 key，会报 Undefined index 错误
---
 src/SocialiteManager.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/SocialiteManager.php b/src/SocialiteManager.php
index 8815850..d7c0966 100644
--- a/src/SocialiteManager.php
+++ b/src/SocialiteManager.php
@@ -130,7 +130,8 @@ public function driver($driver = null)
      */
     protected function createDriver($driver)
     {
-        if ($provider = $this->initialDrivers[$driver]) {
+        if (isset($this->initialDrivers[$driver])) {
+            $provider = $this->initialDrivers[$driver];
             $provider = __NAMESPACE__.'\\Providers\\'.$provider.'Provider';
 
             return $this->buildProvider($provider, $this->formatConfig($this->config->get($driver)));