DivisionByZeroError: Division by zero

[sentry-io]

Sentry Issue: CREW-TIMETRACKING-API-9Z

DivisionByZeroError: Division by zero
  File "/app/Services/AbsenceService.php", line 470, in App\Services\AbsenceService::getAbsenceCount
    return round($absence->start->floatDiffInHours($absence->stop) / $hoursPerDay, 2);
  File "/app/Services/AbsenceService.php", line 370, in App\Services\AbsenceService::getDefaultAbsencesByTypeAndYear
    $absenceCount = $this->getAbsenceCount($absence, $hoursPerDay, $absence->start->year);
  File "/app/Http/Controllers/Api/v1/Employee/AbsencesOverviewController.php", line 24, in App\Http\Controllers\Api\v1\Employee\AbsencesOverviewController::overview
    $this->absenceService->getDefaultAbsencesByTypeAndYear($employee)
  File "/app/Http/Middleware/SeparateWithParam.php", line 12, in App\Http\Middleware\SeparateWithParam::handle
    return $next($request);
  File "/public/index.php", line 51
    $response = $kernel->handle(
...
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