We got some crashes: "ASDN::Mutex::~Mutex()"

[wangyutao0424]

I found some crashes on my platform of crash report, it only appear on iOS 11.
2.5 version we used.

[anuragt84]

We see this crash as well. For us, it is probably happening when the app is being force quit.

[nguyenhuy]

#577 fixed a similar crash. Please update to 2.5.1 and let us know if you still see it.