diff --git a/FlashMQTests/mainappthread.cpp b/FlashMQTests/mainappthread.cpp
index 974ae92..f00204b 100644
--- a/FlashMQTests/mainappthread.cpp
+++ b/FlashMQTests/mainappthread.cpp
@@ -19,15 +19,19 @@ License along with FlashMQ. If not, see <https://www.gnu.org/licenses/>.
 
 MainAppThread::MainAppThread(QObject *parent) : QThread(parent)
 {
+    MainApp::initMainApp(1, nullptr);
+    appInstance = MainApp::getMainApp();
+    appInstance->settings->allowAnonymous = true;
+}
+
+MainAppThread::~MainAppThread()
+{
     if (appInstance)
     {
         delete appInstance;
+        MainApp::instance = nullptr;
     }
     appInstance = nullptr;
-    MainApp::instance = nullptr;
-    MainApp::initMainApp(1, nullptr);
-    appInstance = MainApp::getMainApp();
-    appInstance->settings->allowAnonymous = true;
 }
 
 void MainAppThread::run()
diff --git a/FlashMQTests/mainappthread.h b/FlashMQTests/mainappthread.h
index 8bc9317..d5ef145 100644
--- a/FlashMQTests/mainappthread.h
+++ b/FlashMQTests/mainappthread.h
@@ -28,6 +28,7 @@ class MainAppThread : public QThread
     MainApp *appInstance = nullptr;
 public:
     explicit MainAppThread(QObject *parent = nullptr);
+    ~MainAppThread();
 
 public slots:
     void run() override;
diff --git a/FlashMQTests/tst_maintests.cpp b/FlashMQTests/tst_maintests.cpp
index eaa51a4..14294a9 100644
--- a/FlashMQTests/tst_maintests.cpp
+++ b/FlashMQTests/tst_maintests.cpp
@@ -102,6 +102,7 @@ MainTests::~MainTests()
 
 void MainTests::init()
 {
+    mainApp.reset();
     mainApp.reset(new MainAppThread());
     mainApp->start();
     mainApp->waitForStarted();