diff --git a/test/classes/ConfigStorage/RelationTest.php b/test/classes/ConfigStorage/RelationTest.php
index 8de291d837..7ad2610fee 100644
--- a/test/classes/ConfigStorage/RelationTest.php
+++ b/test/classes/ConfigStorage/RelationTest.php
@@ -1939,13 +1939,17 @@ class RelationTest extends AbstractTestCase
             ['NULL'],
         );
 
+        $dummyDbi->addResult(
+            'SELECT `tables` FROM `PMA-storage`.`pma__favorite_custom` WHERE `username` = \'\'',
+            [],
+        );
         $dummyDbi->addResult(
             'SELECT `tables` FROM `PMA-storage`.`pma__favorite_custom` WHERE `username` = \'\'',
             [],
         );
 
         $_SESSION['relation'] = [];
-        $_SESSION['tmpval'] = [];
+        (new ReflectionClass(Relation::class))->getProperty('cache')->setValue([]);
 
         $relation = new Relation($dbi);
         $relation->initRelationParamsCache();