void OnEnable() {
    Application.logMessageReceived += OnLogException;
}

void OnDisable() {
    Application.logMessageReceived -= OnLogException;
}

static private void OnLogException(string _message, string _stackTrace, LogType _logType) {
    if (_logType == LogType.Exception) {
        if (Application.isEditor) {
            // Only break in editor to allow examination of the current scene state.
            Debug.Break();
        } else {
            // There's no standard way to return an error code to the OS,
            // so just quit regularly.
            File.WriteAllText("traceback.txt", _stackTrace);
            Application.Quit();
        }
    }
}