From 5428665f826c576c6398d44e2301743cdd841439 Mon Sep 17 00:00:00 2001
From: wdwen <wangdaiwen@gmail.com>
Date: Wed, 9 Jul 2014 18:39:41 +0800
Subject: [PATCH] logout method crash

when user not login, call logout method will crash
---
 evernote-sdk-ios/EvernoteSession.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/evernote-sdk-ios/EvernoteSession.m b/evernote-sdk-ios/EvernoteSession.m
index c66296d..c942ea5 100755
--- a/evernote-sdk-ios/EvernoteSession.m
+++ b/evernote-sdk-ios/EvernoteSession.m
@@ -326,6 +326,9 @@ - (void)logout
     // Clear all clients
     [self clearAllClients];
     
+    if (!authToken || authToken.length == 0) {
+        return;
+    }
     // Revoke the token, this is not necessary, but it's good practice
     [[EvernoteUserStore userStore] revokeLongSessionWithAuthenticationToken:authToken success:nil failure:nil];
 }