Application crashed when I run it, log in, and select edit.

//  EditFriendsTableViewController.m
//  Ribbit
//
//  Created by Glenn Seplowitz on 8/9/15.
//  Copyright (c) 2015 Glenn Seplowitz. All rights reserved.
//

#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(@"Error: %@ %@", error, [error userInfo]);
        } else {
            self.allUsers = objects;
            [self.tableView reloadData];
        }

    }];
}


#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
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

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

    return cell;
}

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

}


@end