diff --git a/addons/project_timesheet_holidays/models/project_task.py b/addons/project_timesheet_holidays/models/project_task.py
index fac32a30904..660ad45e52a 100644
--- a/addons/project_timesheet_holidays/models/project_task.py
+++ b/addons/project_timesheet_holidays/models/project_task.py
@@ -32,7 +32,7 @@ class Task(models.Model):
             ['timesheet_task_ids:array_agg(timesheet_task_id)'],
             [],
         )
-        timeoff_task_ids = leave_type_read_group[0]['timesheet_task_ids'] if leave_type_read_group else []
+        timeoff_task_ids = leave_type_read_group[0]['timesheet_task_ids'] if leave_type_read_group[0]['timesheet_task_ids'] else []
         if self.env.company.leave_timesheet_task_id:
             timeoff_task_ids.append(self.env.company.leave_timesheet_task_id.id)
         if operator == '!=':
diff --git a/addons/project_timesheet_holidays/tests/test_timesheet_global_time_off.py b/addons/project_timesheet_holidays/tests/test_timesheet_global_time_off.py
index 0112b111992..814f35d9903 100644
--- a/addons/project_timesheet_holidays/tests/test_timesheet_global_time_off.py
+++ b/addons/project_timesheet_holidays/tests/test_timesheet_global_time_off.py
@@ -175,3 +175,12 @@ class TestTimesheetGlobalTimeOff(common.TransactionCase):
         # The standard calendar is for 8 hours/day from 8 to 12 and from 13 to 17.
         # So we need to check that the timesheets don't have more than 8 hours per day.
         self.assertEqual(leave_task.effective_hours, 80)
+
+    def test_search_is_timeoff_task(self):
+        """ Test the search method on is_timeoff_task
+        with and without any hr.leave.type with timesheet_task_id defined"""
+        leaves_types_with_task_id = self.env['hr.leave.type'].search([('timesheet_task_id', '!=', False)])
+        self.env['project.task'].search([('is_timeoff_task', '!=', False)])
+
+        leaves_types_with_task_id.write({'timesheet_task_id': False})
+        self.env['project.task'].search([('is_timeoff_task', '!=', False)])