diff --git a/addons/knowledge/models/knowledge_article.py b/addons/knowledge/models/knowledge_article.py
index dfe5142d1c4..0f3b25c16b1 100644
--- a/addons/knowledge/models/knowledge_article.py
+++ b/addons/knowledge/models/knowledge_article.py
@@ -412,6 +412,9 @@ class Article(models.Model):
     @api.depends_context('uid')
     @api.depends('favorite_ids.user_id')
     def _compute_is_user_favorite(self):
+        if self.env.user._is_public():
+            self.is_user_favorite = False
+            return
         for article in self:
             favorite = article.favorite_ids.filtered(lambda f: f.user_id == self.env.user)
             article.is_user_favorite = bool(favorite)
diff --git a/addons/website_knowledge/tests/test_knowledge_security.py b/addons/website_knowledge/tests/test_knowledge_security.py
index cbad5180c4a..58265b0ed8c 100644
--- a/addons/website_knowledge/tests/test_knowledge_security.py
+++ b/addons/website_knowledge/tests/test_knowledge_security.py
@@ -21,10 +21,11 @@ class TestWKnowledgeSecurity(KnowledgeCommonWData):
 
         article_shared.sudo().website_published = True
         article_shared.body  # access body should not trigger acls
+        self.assertFalse(article_shared.is_user_favorite)
 
         # FAVOURITE
         with self.assertRaises(exceptions.AccessError, msg='ACLs: No favorite access to public'):
-            article_shared.is_user_favorite
+            self.env['knowledge.article.favorite'].search([])
 
     @mute_logger('odoo.addons.base.models.ir_model', 'odoo.addons.base.models.ir_rule')
     @users('portal_test')