diff --git a/addons/resource/models/resource_calendar_leaves.py b/addons/resource/models/resource_calendar_leaves.py
index a9f1a27452b..03900e400f6 100644
--- a/addons/resource/models/resource_calendar_leaves.py
+++ b/addons/resource/models/resource_calendar_leaves.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from datetime import datetime, time
@@ -55,6 +54,8 @@ class ResourceCalendarLeaves(models.Model):
     def _compute_date_to(self):
         user_tz = timezone(self.env.user.tz or self._context.get('tz') or self.company_id.resource_calendar_id.tz or 'UTC')
         for leave in self:
+            if not leave.date_from:
+                continue
             date_to_tz = user_tz.localize(leave.date_from) + relativedelta(hour=23, minute=59, second=59)
             leave.date_to = date_to_tz.astimezone(utc).replace(tzinfo=None)
 
diff --git a/addons/resource/tests/test_utils.py b/addons/resource/tests/test_utils.py
index e262061d0e7..5dceabade1b 100644
--- a/addons/resource/tests/test_utils.py
+++ b/addons/resource/tests/test_utils.py
@@ -1,9 +1,11 @@
-# -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
+from dateutil.relativedelta import relativedelta
 
+from odoo.fields import Datetime
 from odoo.tests.common import TransactionCase
 from odoo.osv.expression import normalize_domain
 from odoo.addons.resource.models import utils
+from odoo.tests import Form
 
 
 class TestExpression(TransactionCase):
@@ -57,3 +59,26 @@ class TestExpression(TransactionCase):
                 field_name_mapping={'field3': 'field4'},
             ))
         )
+
+    def test_resource_creation_with_date_from(self):
+        """
+        Test resource creation with a date_from.
+        AssertError is raised when date_from is not provided.
+        """
+
+        with self.assertRaises(AssertionError):
+            with Form(self.env['resource.calendar.leaves']) as res:
+                res.date_from = False
+                res.date_to = Datetime.now()
+
+        with Form(self.env['resource.calendar.leaves']) as res:
+            date_from = Datetime.now()
+            date_to = Datetime.now() + relativedelta(hours=24)
+            res.date_from = date_from
+            res.date_to = date_to
+
+            self.assertFalse(res.id, 'The resource does not have an id before saving')
+            res.save()
+            self.assertTrue(res.id, 'The resource was successfully created')
+            self.assertEqual(res.date_from, Datetime.to_string(date_from))
+            self.assertEqual(res.date_to, Datetime.to_string(date_to))