[Android] Crash on app launch due to NullPointerException in ActivityWechatProxy

[artyom-v]

Some users experience a crash on app startup with the following exception:

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxx.xxx/com.xsolla.android.login.ui.ActivityWechatProxy}: java.lang.NullPointerException
Caused by java.lang.NullPointerException:
       at com.xsolla.android.login.ui.ActivityWechatProxy.onCreate(ActivityWechatProxy.kt:23)

Environment:
Unity version: 2022.3.62f2
Xsolla Store Unity SDK: v3.0.1