diff --git a/tests/_test_msui/test_mscolab.py b/tests/_test_msui/test_mscolab.py
index 02b280afd..55f828520 100644
--- a/tests/_test_msui/test_mscolab.py
+++ b/tests/_test_msui/test_mscolab.py
@@ -32,6 +32,7 @@
 import requests.exceptions
 import mock
 import pytest
+import random
 
 import mslib.utils.auth
 from mslib.mscolab.conf import mscolab_settings
@@ -411,6 +412,69 @@ def assert_logout_text():
         qtbot.wait_until(assert_label_text)
         # ToDo verify all operations disabled again without a visual check
 
+    def test_operation_while_switching_error(self, qtbot):
+        """Test that operation switching trigger the KeyError"""
+
+        # test after activating operation
+        self._activate_operation_at_index(0)
+        self.window.actionTopView.trigger()
+
+        def assert_active_views():
+            # check 1 view opened
+            assert len(self.window.get_active_views()) == 1
+        qtbot.wait_until(assert_active_views)
+
+        topview_0 = self.window.listViews.item(0)
+        assert topview_0.window.tv_window_exists is True
+        # topview_0.window.setAttribute(QtCore.Qt.WA_DeleteOnClose)
+
+        # def assert_attribute():
+        #     assert topview_0.window.testAttribute(QtCore.Qt.WA_DeleteOnClose)
+        # qtbot.wait_until(assert_attribute)
+
+        # open multiple flightpath
+        topview_0.window.cbTools.currentIndexChanged.emit(6)
+
+        def assert_dock_loaded():
+            assert topview_0.window.docks[5] is not None
+        qtbot.wait_until(assert_dock_loaded)
+
+        # more operations for the user
+        for op_name in ["second", "third"]:
+            assert add_operation(op_name, "description")
+            assert add_user_to_operation(path=op_name, emailid=self.userdata[0])
+
+        self._connect_to_mscolab(qtbot)
+        modify_config_file({"MSS_auth": {self.url: self.userdata[0]}})
+        self._login(qtbot, emailid=self.userdata[0], password=self.userdata[2])
+
+        # activate all operation, this enables them in the docking widget too
+        for _ in range(6):
+            self._activate_operation_at_index(random.randint(0, 2))
+        self._activate_flight_track_at_index(0)
+
+        # # Create the new operation
+        # op_name = "fourth"
+        # assert add_operation(op_name, "description")
+        # assert add_user_to_operation(path=op_name, emailid=self.userdata[0])
+        #
+        # for _ in range(4):
+        #     self._activate_operation_at_index(random.randint(0, 3))
+        # self._activate_flight_track_at_index(0)
+
+        with mock.patch("PyQt5.QtWidgets.QMessageBox.warning", return_value=QtWidgets.QMessageBox.Yes):
+            topview_0.window.close()
+
+        def assert_window_closed():
+            assert topview_0.window.tv_window_exists is False
+        qtbot.wait_until(assert_window_closed)
+
+        self.window.mscolab.logout()
+
+        def assert_logout_text():
+            assert self.window.usernameLabel.text() == "User"
+        qtbot.wait_until(assert_logout_text)
+
     def test_multiple_flightpath_switching_to_flighttrack_and_logout(self, qtbot):
         """
         checks that we can switch in topviews with the multiple flightpath dockingwidget