From 703fd9afbc160b62fc77c276d350be5677f071bf Mon Sep 17 00:00:00 2001
From: "Hoa V. DINH" <dinh.viet.hoa@gmail.com>
Date: Tue, 14 May 2013 21:31:08 -0700
Subject: Fixed exception

---
 example/mac/macExample/macExample/MCTMsgViewController.m | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'example/mac')

diff --git a/example/mac/macExample/macExample/MCTMsgViewController.m b/example/mac/macExample/macExample/MCTMsgViewController.m
index adfa009c..e0205867 100644
--- a/example/mac/macExample/macExample/MCTMsgViewController.m
+++ b/example/mac/macExample/macExample/MCTMsgViewController.m
@@ -186,7 +186,9 @@ typedef void (^DownloadCallback)(NSError * error);
     [op setProgress:^(unsigned int current, unsigned int maximum) {
         NSLog(@"progress content: %u/%u", current, maximum);
     }];
-    [_ops addObject:op];
+    if (op != nil) {
+        [_ops addObject:op];
+    }
     if (downloadFinished != NULL) {
         NSMutableArray * blocks;
         blocks = [_callbacks objectForKey:partUniqueID];
-- 
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