From 28109c4c706fae230f35115cb8d5a26775a0eeed Mon Sep 17 00:00:00 2001
From: Bogdan Poplauschi <bpoplauschi@gmail.com>
Date: Mon, 21 Jul 2014 15:27:16 +0300
Subject: [PATCH] Fixed SDWebImageCombinedOperation cancel crash (#798 #809)

---
 SDWebImage/SDWebImageManager.m | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index 745d112..a8f9361 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -298,10 +298,13 @@
 @implementation SDWebImageCombinedOperation
 
 - (void)setCancelBlock:(SDWebImageNoParamsBlock)cancelBlock {
+    // check if the operation is already cancelled, then we just call the cancelBlock
     if (self.isCancelled) {
-        if (cancelBlock) cancelBlock();
-    }
-    else {
+        if (cancelBlock) {
+            cancelBlock();
+        }
+        _cancelBlock = nil; // don't forget to nil the cancelBlock, otherwise we will get crashes
+    } else {
         _cancelBlock = [cancelBlock copy];
     }
 }