E/com.avos.avoscloud.AVObject: AVObject->get->972:  err:java.lang.NullPointerException: Attempt to invoke interface method 'java.util.concurrent.locks.Lock java.util.concurrent.locks.ReadWriteLock.readLock()' on a null object reference

出错代码：

Tag.getQuery(Tag.class).whereEqualTo(Tag.NAME, “name”).whereDoesNotExist(Tag.BELONG).getFirst();

SDK v3.13.7
是百分百出现

@AVClassName("Tag")
public class Tag extends AVObject {
    public static final Creator CREATOR = AVObjectCreator.instance;
    ......
}