diff --git a/addons/website/models/ir_model.py b/addons/website/models/ir_model.py
index e67f91c970a..35eb225d8ff 100644
--- a/addons/website/models/ir_model.py
+++ b/addons/website/models/ir_model.py
@@ -20,7 +20,11 @@ class BaseModel(models.AbstractModel):
         :return: the base url for this record
         :rtype: string
         """
+        # Ensure zero or one record
+        if not self:
+            return super().get_base_url()
         self.ensure_one()
+
         if self._name == 'website':
             # Note that website_1.company_id.website_id might not be website_1
             return self._get_http_domain() or super().get_base_url()
diff --git a/addons/website/tests/test_base_url.py b/addons/website/tests/test_base_url.py
index 9b8180713f1..9b5d232a23e 100644
--- a/addons/website/tests/test_base_url.py
+++ b/addons/website/tests/test_base_url.py
@@ -117,3 +117,12 @@ class TestGetBaseUrl(odoo.tests.TransactionCase):
         website_2.unlink()
         # .. on unlink ..
         self.assertEqual(attach.get_base_url(), web_base_url, "Cache should be recomputed, no more website for company_1.")
+
+    def test_02_get_base_url_recordsets(self):
+        Attachment = self.env['ir.attachment']
+        web_base_url = self.env['ir.config_parameter'].sudo().get_param('web.base.url')
+        self.assertEqual(Attachment.get_base_url(), web_base_url, "Empty recordset should get ICP value.")
+
+        with self.assertRaises(ValueError):
+            # if more than one record, an error we should be raised
+            Attachment.search([], limit=2).get_base_url()
diff --git a/addons/website_payment/models/payment_acquirer.py b/addons/website_payment/models/payment_acquirer.py
index a341bdbc87b..8676b6c6ce1 100644
--- a/addons/website_payment/models/payment_acquirer.py
+++ b/addons/website_payment/models/payment_acquirer.py
@@ -14,7 +14,6 @@ class PaymentAcquirer(models.Model):
     )
 
     def get_base_url(self):
-        self.ensure_one()
         # Give priority to url_root to handle multi-website cases
         if request and request.httprequest.url_root:
             return request.httprequest.url_root
diff --git a/odoo/models.py b/odoo/models.py
index 4782e383fd1..6c6a4c17fbe 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -3320,7 +3320,8 @@ Fields:
         :rtype: string
 
         """
-        self.ensure_one()
+        if len(self) > 1:
+            raise ValueError("Expected singleton or no record: %s" % self)
         return self.env['ir.config_parameter'].sudo().get_param('web.base.url')
 
     def _check_concurrency(self):