diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
index d2621a8..d97a1f5 100644
--- a/src/ui/mainwindow.cpp
+++ b/src/ui/mainwindow.cpp
@@ -979,15 +979,10 @@ void MainWindow::prepare_exit()
     Configs::dataStore->save_control_no_save = true; // don't change datastore after this line
     profile_stop(false, true);
 
-    QMutex coreKillMu;
-    coreKillMu.lock();
-    runOnThread([=, this, &coreKillMu]()
+    runOnThread([=, this]()
     {
         core_process->Kill();
-        coreKillMu.unlock();
-    }, DS_cores);
-    coreKillMu.lock();
-    coreKillMu.unlock();
+    }, DS_cores, true);
 
     mu_exit.unlock();
     qDebug() << "prepare exit done!";