Unity2018.2.3 call java method crash

when i run the code under the latest unity version 2018.2.3f1 it cause a crash in IL2CPP build.
AndroidJavaObject mapObj = new AndroidJavaObject(“java.util.HashMap”);
mapObj.Call(“put”, “publicKey”, “keyabc”);
But everything goes OK on version 2018.1.3
Is there anyone who know what’s happened or it is a bug of unity engine~

Very likely this: Unity Issue Tracker - Android application crashes when native function returns null