diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index a8f93610..2781ec87 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -317,7 +317,11 @@
     }
     if (self.cancelBlock) {
         self.cancelBlock();
-        self.cancelBlock = nil;
+        
+        // TODO: this is a temporary fix to #809.
+        // Until we can figure the exact cause of the crash, going with the ivar instead of the setter
+//        self.cancelBlock = nil;
+        _cancelBlock = nil;
     }
 }