diff --git a/tests/test_gui/test_gui_i18n.py b/tests/test_gui/test_gui_i18n.py
index 83638f13..f41d0970 100644
--- a/tests/test_gui/test_gui_i18n.py
+++ b/tests/test_gui/test_gui_i18n.py
@@ -64,6 +64,8 @@ def testGuiI18n_Localisation(qtbot, monkeypatch, language, nwGUI, projPath):
         qtbot.waitUntil(lambda: SHARED.findTopLevelWidget(dType) is not None, timeout=1000)
         dialog = SHARED.findTopLevelWidget(dType)
         assert isinstance(dialog, dType)
+        assert dialog is not None
+        dialog.deleteLater()
 
     showDialog(nwGUI.showWelcomeDialog, GuiWelcome)
     showDialog(nwGUI.showPreferencesDialog, GuiPreferences)