JNI error when calling Java plugin from System.AppDomain.CurrentDomain.UnhandledException callback handler

Hello everyone, when I try to access my Java plugin from application's unhandled exception callback I'm getting the following errors and my application freezes:

 JNI ERROR (app bug): accessed stale Local 0x9  (index 0 in a table of size 0)
 JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x9

Here is my C# script, attached to one of the game objects:

 using UnityEngine;
 using System.Threading;
 using System;

 public class PlayerController : MonoBehaviour
 {
     void Start()
     {
         AppDomain.CurrentDomain.UnhandledException += OnHandleUnresolvedException;

         using (var javaClass = new AndroidJavaClass("MyJavaClass"))
         {
             var str = javaClass.CallStatic<string>("GetString");
             Debug.Log("String from Java class: " + str);
         }

         new Thread(() =>
         {
             Thread.Sleep(10000);
             object obj = null;
             obj.ToString();
         }).Start();
     }

     private static void OnHandleUnresolvedException(object sender, UnhandledExceptionEventArgs e)
     {
         var message = ((Exception)e.ExceptionObject).Message;
         Debug.Log("Unhandled exception: " + message);

         using (var javaClass = new AndroidJavaClass("MyJavaClass"))
         {
             javaClass.CallStatic("ErrorOccurred", message);
         }
     }
 }

And here is the Java plugin source code. It is added to Unity project as a simple ".java" file in the assets folder, plugin import settings are correctly configured ("Android" checkbox checked):

 import android.util.Log;

 public class MyJavaClass
 {
     public static void ErrorOccurred(String message)
     {
         Log.e("TAG", message);
     }

     public static String GetString()
     {
         return "test";
     }
 }

When I start my application on Android emulator I see the following messages in the Logcat window:

 I/Unity: String from Java class: test
 I/Unity: Unhandled exception: Object reference not set to an instance of an object
 E/zygote: JNI ERROR (app bug): accessed stale Local 0x9  (index 0 in a table of size 0)
 A/zygote: java_vm_ext.cc:534] JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x9

Any tips will be greatly appreciated!