How to fix my "Notice: Undefined offset: 4" error - php

Question

I have a problem with my code, when a User have all "stations" the code work but if he dont have one i have the (undefined offset *) error,
my code look like that ( in my controller )
public function index()
{
$entityManager = $this->getDoctrine()->getManager();
$stations = $this->getListOfStations();
$stationsJson = [];
$events = $entityManager->getRepository('App:User')
->getEventInRealTime($this->getUser());
foreach ($stations as $station) {
$stationsJson[] = [
'typeEvents' => $events[$station->getId()],
];
}
return new JsonResponse(array('stations' => $stationsJson));
}
private function getListOfStations()
{
/** #var UserInterface $user */
$user = $this->getUser();
$entityManager = $this->getDoctrine()->getManager();
if (!$this->authorizationChecker->isGranted('ROLE_SUPER_ADMIN')) {
$stations = $user->getStations();
} else {
$stations = $entityManager->getRepository('App:Station')->findAll();
}
return $stations;
}
and my repository
public function getEventInRealTime($user)
{
$qb = $this->createQueryBuilder('u');
$events = $qb
->select('s.id as stationId, COUNT(e) as number, e.label as type')
->innerJoin('u.stations', 's')
->innerJoin('s.events', 'e')
->where('u = :user')
->setParameter('user', $user)
->andWhere('DAY(e.currentTime) =:day')
->setParameter('day', date('d'))
->andWhere('MONTH(e.currentTime) =:month')
->setParameter('month', date('m'))
->andWhere('YEAR(e.currentTime) =:year')
->setParameter('year', date('Y'))
->groupBy('s.id, type');
$data = $events->getQuery()->getArrayResult();
$result = [];
foreach ($data as $row) {
$result[$row['stationId']][] =
[
'number' => $row['number'],
'type' => $row['type']
];
}
return $result;
}
i think its a problem its like, he dont find the "stations" when i do a findAll(), but i dont know how to fix it, when the user is super_admin he can have see all the stations but if is not super admin he can see only his stations