deselectRowAtIndexPath fails to deselect a row

//
//  EditFriendsTableViewController.m
//  Ribbit
//

#import "EditFriendsTableViewController.h"
#import <Parse/Parse.h>

@interface EditFriendsTableViewController ()

@end

@implementation EditFriendsTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    PFQuery * query = [PFUser query];
    [query orderByAscending:@"username"];
    [query findObjectsInBackgroundWithBlock:^(NSArray * objects, NSError * error){
        if (error) {
            NSLog(@"the error %@, %@",error,error.userInfo);
        }else{

            self.allusers = objects;
            [self.tableView reloadData];

            self.currentUser = [PFUser currentUser];

        }


    }];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    // Return the number of rows in the section.
    return self.allusers.count;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];

    PFUser * user = [self.allusers objectAtIndex:indexPath.row];
    cell.textLabel.text = user.username;
    return cell;
}

-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath{

    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];

    UITableViewCell * cell = [tableView cellForRowAtIndexPath:indexPath];
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
    PFRelation * friendsRelation = [self.currentUser relationForKey:@"friendsRelation"];

     PFUser * user = [self.allusers objectAtIndex:indexPath.row];
    [friendsRelation addObject:user];
    [self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError * error){

        if (error) {
            NSLog(@"error %@, %@", error,error.userInfo);
        }

    }];

}


/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end