NullPointerException when closing a streaming statement twice

package com.dms.mariadb;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.Statement;

public class MariaDbNPETest

{

    public static void main(final String[] args)

    {

        try (final Connection dbConnection = DriverManager.getConnection("jdbc:mariadb://<machine>:<port>/<dbName>", "<username>", "<password>"))

        {

            Class.forName("org.mariadb.jdbc.Driver");

            final Statement statement = dbConnection.createStatement();

            // Make sure it is a streaming statement:

            statement.setFetchSize(Integer.MIN_VALUE);

            for (int count = 1; count <= 10; count++)

            {

                try

                {

                    System.out.println("Closing count: " + count);

                    statement.close();

                }

                catch (final Exception ex)

                {

                    ex.printStackTrace();

                    break;

                }

            }

        }

        catch (final Exception ex)

        {

            ex.printStackTrace();

        }

    }

}

Closing count: 1

Closing count: 2

java.lang.NullPointerException

	at org.mariadb.jdbc.MariaDbStatement.getInternalMoreResults(MariaDbStatement.java:908)

	at org.mariadb.jdbc.MariaDbStatement.close(MariaDbStatement.java:588)

	at com.dms.mariadb.MariaDbNPETest.main(MariaDbNPETest.java:31)