diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 934c980..a90f145 100755
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -201,11 +201,11 @@ class MainWindow(QtWidgets.QMainWindow):
 
             case ThermostatConnectionState.CONNECTING:
                 self._connecting_task.cancel()
+                self._connecting_task = None
                 await self._thermostat.end_session()
                 self._thermostat.connection_state = (
                     ThermostatConnectionState.DISCONNECTED
                 )
-                self._connecting_task = None
 
             case ThermostatConnectionState.CONNECTED:
                 await self._thermostat.end_session()