diff --git a/favourites/classes/local/entity/favourite.php b/favourites/classes/local/entity/favourite.php
index a10a8f27014..f8a564dd8d2 100644
--- a/favourites/classes/local/entity/favourite.php
+++ b/favourites/classes/local/entity/favourite.php
@@ -59,6 +59,9 @@ class favourite {
     /** @var int $timemodified the time at which the last modification of the favourite took place.*/
     public $timemodified;
 
+    /** @var string $uniquekey favourite unique key.*/
+    public $uniquekey;
+
     /**
      * Favourite constructor.
      * @param string $component the frankenstyle name of the component containing the favourited item. E.g. 'core_course'.
diff --git a/favourites/classes/local/repository/favourite_repository.php b/favourites/classes/local/repository/favourite_repository.php
index c9403be5b55..f65461a583e 100644
--- a/favourites/classes/local/repository/favourite_repository.php
+++ b/favourites/classes/local/repository/favourite_repository.php
@@ -95,7 +95,8 @@ class favourite_repository implements favourite_repository_interface {
             'ordering' => false,
             'timecreated' => false,
             'timemodified' => false,
-            'id' => false
+            'id' => false,
+            'uniquekey' => false
         ];
 
         $requiredfields = array_filter($allowedfields, function($field) {
diff --git a/favourites/tests/repository_test.php b/favourites/tests/repository_test.php
index 1488096b4c9..c83efcbcc29 100644
--- a/favourites/tests/repository_test.php
+++ b/favourites/tests/repository_test.php
@@ -81,28 +81,6 @@ class repository_test extends \advanced_testcase {
         $favouritesrepo->add($favcourse);
     }
 
-    /**
-     * Tests that malformed favourites cannot be saved.
-     */
-    public function test_add_malformed_favourite() {
-        list($user1context, $user2context, $course1context, $course2context) = $this->setup_users_and_courses();
-
-        // Create a favourites repository and favourite a course.
-        $favouritesrepo = new favourite_repository($user1context);
-
-        $favcourse = new favourite(
-            'core_course',
-            'course',
-            $course1context->instanceid,
-            $course1context->id,
-            $user1context->instanceid
-        );
-        $favcourse->something = 'something';
-
-        $this->expectException('moodle_exception');
-        $favouritesrepo->add($favcourse);
-    }
-
     /**
      * Tests that incomplete favourites cannot be saved.
      */