Added mutex to prevent config corruption #3817

SettingsManager.h

@@ -12,6 +12,7 @@
 #pragma once
 
 #include "json.hpp"
+#include <mutex>
 #include "filesystem.h"
 
 using json = nlohmann::json;
@@ -45,4 +46,6 @@ private:
     json             settings_data;
     json             settings_prototype;
     filesystem::path settings_filename;
+    std::mutex       mutex;
+    bool             config_found;
 };