From bdef7651f02e3e725a46b1d30045d0ebf96ef4a3 Mon Sep 17 00:00:00 2001
From: Jonas Salling <jonas@salling.com>
Date: Tue, 22 Apr 2014 14:52:20 +0200
Subject: [PATCH] Update SDWebImageDownloaderOperation.m

Fixing race condition that causes cancellation of one download operation to stop a run loop that is now used for another download operation. Race is introduced through -performSelector:onThread:withObject:waitUntilDone:
---
 SDWebImage/SDWebImageDownloaderOperation.m | 1 +
 1 file changed, 1 insertion(+)

diff --git a/SDWebImage/SDWebImageDownloaderOperation.m b/SDWebImage/SDWebImageDownloaderOperation.m
index 05783f8..baced7c 100644
--- a/SDWebImage/SDWebImageDownloaderOperation.m
+++ b/SDWebImage/SDWebImageDownloaderOperation.m
@@ -129,6 +129,7 @@
 }
 
 - (void)cancelInternalAndStop {
+    if (self.isFinished) return;
     [self cancelInternal];
     CFRunLoopStop(CFRunLoopGetCurrent());
 }