self in block

UIKit+AFNetworking/AFImageDownloader.m

@@ -254,7 +254,7 @@
                        completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
                            dispatch_async(self.responseQueue, ^{
                                __strong __typeof__(weakSelf) strongSelf = weakSelf;
-                               AFImageDownloaderMergedTask *mergedTask = self.mergedTasks[URLIdentifier];
+                               AFImageDownloaderMergedTask *mergedTask = strongSelf.mergedTasks[URLIdentifier];
                                if ([mergedTask.identifier isEqual:mergedTaskIdentifier]) {
                                    mergedTask = [strongSelf safelyRemoveMergedTaskWithURLIdentifier:URLIdentifier];
                                    if (error) {