diff --git a/addons/survey/tests/test_survey_invite.py b/addons/survey/tests/test_survey_invite.py
index 9c8a29a709e..0b86bf3dbd0 100644
--- a/addons/survey/tests/test_survey_invite.py
+++ b/addons/survey/tests/test_survey_invite.py
@@ -84,6 +84,17 @@ class TestSurveyInvite(common.TestSurveyCommon):
         self.assertEqual(answers.mapped('partner_id'), self.customer)
         self.assertEqual(set(answers.mapped('deadline')), set([deadline]))
 
+        with self.subTest('Warning when inviting an already invited partner'):
+            action = self.survey.action_send_survey()
+            invite_form = Form(self.env[action['res_model']].with_context(action['context']))
+            invite_form.send_email = True
+            invite_form.partner_ids.add(self.customer)
+
+            self.assertIn(self.customer, invite_form.existing_partner_ids)
+            self.assertEqual(invite_form.existing_text,
+                             'The following customers have already received an invite: Caroline Customer.')
+
+
     @users('survey_manager')
     def test_survey_invite_authentication_nosignup(self):
         Answer = self.env['survey.user_input']
diff --git a/addons/survey/wizard/survey_invite.py b/addons/survey/wizard/survey_invite.py
index a2192ec54ba..cbb81a121ec 100644
--- a/addons/survey/wizard/survey_invite.py
+++ b/addons/survey/wizard/survey_invite.py
@@ -71,8 +71,7 @@ class SurveyInvite(models.TransientModel):
 
     @api.depends('partner_ids', 'survey_id')
     def _compute_existing_partner_ids(self):
-        existing_answers = self.survey_id.user_input_ids
-        self.existing_partner_ids = existing_answers.mapped('partner_id') & self.partner_ids
+        self.existing_partner_ids = list(set(self.survey_id.user_input_ids.partner_id.ids) & set(self.partner_ids.ids))
 
     @api.depends('emails', 'survey_id')
     def _compute_existing_emails(self):