diff --git a/addons/hr_holidays/models/hr_leave_allocation.py b/addons/hr_holidays/models/hr_leave_allocation.py
index 75807316027..2b276690345 100644
--- a/addons/hr_holidays/models/hr_leave_allocation.py
+++ b/addons/hr_holidays/models/hr_leave_allocation.py
@@ -225,7 +225,7 @@ class HolidaysAllocation(models.Model):
     def _compute_number_of_hours_display(self):
         for allocation in self:
             allocation_calendar = allocation.holiday_status_id.company_id.resource_calendar_id
-            if allocation.holiday_type == 'employee':
+            if allocation.holiday_type == 'employee' and allocation.employee_id:
                 allocation_calendar = allocation.employee_id.sudo().resource_calendar_id
 
             allocation.number_of_hours_display = allocation.number_of_days * (allocation_calendar.hours_per_day or HOURS_PER_DAY)