SDWebImage: Completion handler is not called.

I am trying to manage my map marker with sdwebimage but when i go to background and then when i re-call [imageView setImageWithURL:imageURL placeholderImage:[UIImage imageNamed:[Utils getPlaceholderImageName:location_Details]] options:SDWebImageRetryFailed completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) completion handler is not called, when i tried to debug if (!wself) return; this line is called with wself nil that stopped me to get control of completion block.

UIImageView *imageView=[[UIImageView alloc] init];
                    [imageView setImageWithURL:imageURL placeholderImage:[UIImage imageNamed:[Utils getPlaceholderImageName:location_Details]] options:SDWebImageRetryFailed completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
                        dispatch_async(dispatch_get_main_queue(), ^{
                            long long currentTimestamp = [[NSDate date] timeIntervalSince1970] * MISEC_PER_SEC;
                            currentTimestamp -= (HOWMUCHSTALELOCATIONTOSHOWINMINUTES * MISEC_PER_MIN);

                            if ([[location_Details objectForKey:@"created"] longLongValue] >= currentTimestamp) {

                                marker.icon=[Utils getRoundedMapIcon:image isStale:NO];
                            }else{

                                marker.icon=[Utils getRoundedMapIcon:image isStale:YES];
                            }
                            marker.userData=location_Details;
                            marker.map = self.mapView;
                        });
                    }];

But then when I did this every thing seems to work fine but I am not sure about this, Please help me with this.

if (url) {
        __weak UIImageView *wself = self;
        id <SDWebImageOperation> operation = [SDWebImageManager.sharedManager downloadWithURL:url options:options progress:progressBlock completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished) {
//            if (!wself) return;
            dispatch_main_sync_safe(^{
                @try {
                    if (image) {
                        wself.image = image;
                        [wself setNeedsLayout];
                    }
                    if (completedBlock && finished) {
                        completedBlock(image, error, cacheType);
                    }
                }
                @catch (NSException *exception) {

                }
                @finally {

                }
//                if (!wself) return;

            });
        }];
        objc_setAssociatedObject(self, &operationKey, operation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }