diff --git a/AdaptiveBrightness/main_window.cpp b/AdaptiveBrightness/main_window.cpp
index ce88ee8..5ca4e6a 100644
--- a/AdaptiveBrightness/main_window.cpp
+++ b/AdaptiveBrightness/main_window.cpp
@@ -19,7 +19,7 @@
 #include "sensor_driver.hpp"
 #include "utils.hpp"
 
-MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
+MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent), m_mtx(QMutex::RecursionMode::Recursive)
 {
     qDebug(ltr("Creating main window"));
 
@@ -54,6 +54,8 @@ void MainWindow::closeEvent(QCloseEvent* event)
 
 void MainWindow::enumSensors()
 {
+    m_sensors.clear();
+
     auto sensors = enumerateSensors();
 
     for(auto& sensor: sensors) {