diff --git a/src/Model/test_Model.py b/src/Model/test_Model.py
index f42f2a67..598cfe60 100644
--- a/src/Model/test_Model.py
+++ b/src/Model/test_Model.py
@@ -24,6 +24,7 @@ from Model.Status import StudyStatus
 from Model.Study import Study
 from Model.River import River
 from Model.LateralContribution.LateralContributionTypes import LateralContrib
+from Model.HydraulicStructures.Basic.Types import DischargeWeir
 
 
 class StudyTestCase(unittest.TestCase):
diff --git a/src/View/MainWindow.py b/src/View/MainWindow.py
index dd3e9dee..5ae5da9d 100644
--- a/src/View/MainWindow.py
+++ b/src/View/MainWindow.py
@@ -1525,6 +1525,16 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         sl.show()
 
     def open_reach_sediment_layers(self):
+        if self._study is None:
+            logger.debug(
+                "No study open for reach sediment layers edition..."
+            )
+            return
+
+        if not self._study.river.has_current_reach():
+            self.msg_select_reach()
+            return
+
         reach = self._study.river.current_reach().reach
 
         if self.sub_window_exists(
diff --git a/src/View/test_MainWindow.py b/src/View/test_MainWindow.py
deleted file mode 100644
index 338a6734..00000000
--- a/src/View/test_MainWindow.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# test_MainWindow.py -- Pamhyr
-# Copyright (C) 2026 INRAE
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# -*- coding: utf-8 -*-
-
-import unittest
-
-from types import SimpleNamespace
-from unittest.mock import patch
-
-from View.MainWindow import ApplicationWindow
-
-
-class MainWindowTestCase(unittest.TestCase):
-    @patch("View.MainWindow.subprocess.Popen")
-    def test_open_sqlite_with_spaces_in_study_path(self, popen):
-        path = "/tmp/a study with spaces/example study.pamhyr"
-        window = SimpleNamespace(
-            _study=SimpleNamespace(filename=path)
-        )
-
-        ApplicationWindow.open_sqlite(window)
-
-        popen.assert_called_once_with(["sqlitebrowser", path])