peripheral null

[croccio]

pheripheral is null
how can i get it?? i'm on iOS 8.1

NSDictionary * opts = nil;
  if ([[UIDevice currentDevice].systemVersion floatValue]>=7.0)
  {
    //DebugLog(@"%f",[[UIDevice currentDevice].systemVersion floatValue]);
    opts = @{CBCentralManagerOptionShowPowerAlertKey:@YES};
  }
  central = [[RKCentralManager alloc] initWithQueue:nil options:opts];

  [central scanForPeripheralsWithServices:nil options:@{CBCentralManagerScanOptionAllowDuplicatesKey:@NO} onUpdated:^(RKPeripheral *peripheral) {
    NSLog(@"%@", peripheral);
  }];