Cancel action crashing. Any help?

#pragma mark - IBAction

- (IBAction)cancel:(id)sender {
    [self reset];
    [self.tabBarController setSelectedIndex:0];
}

- (IBAction)send:(id)sender {
    if (self.image == nil && [self.videoFilePath length] == 0) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Oops!" message:@"Please capture a moment!" preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction *ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
        [alertController addAction:ok];

        [self presentViewController:alertController animated:YES completion:nil];
        [self presentViewController:self.imagePicker animated:NO completion:nil];
    } else {
        [self uploadMessage];
        [self.tabBarController setSelectedIndex:0];
    }
}

- (void)reset {
    self.image = nil;
    self.videoFilePath = nil;
    [self.recipients removeAllObjects];