NullPointerException after failover happening on aurora cluster

When failover happens on aurora db cluster, no new connection can be initiated to the db, each attempt generating NPE.

This is the failover triggered exception:
java.sql.SQLException: (conn=322421) Communications link failure with secondary host xxxxx.amazonaws.com:3306. Connection timed out. Driver has reconnect connection
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.get(ExceptionMapper.java:264)
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getException(ExceptionMapper.java:171)
at org.mariadb.jdbc.MariaDbStatement.executeExceptionEpilogue(MariaDbStatement.java:248)
at org.mariadb.jdbc.ServerSidePreparedStatement.executeInternal(ServerSidePreparedStatement.java:432)
at org.mariadb.jdbc.ServerSidePreparedStatement.execute(ServerSidePreparedStatement.java:386)
at org.mariadb.jdbc.ServerSidePreparedStatement.executeQuery(ServerSidePreparedStatement.java:365)
....
Caused by: java.sql.SQLException: Communications link failure with secondary host xxxxx.amazonaws.com:3306. Connection timed out. Driver has reconnect connection
at org.mariadb.jdbc.internal.failover.AbstractMastersListener.throwFailoverMessage(AbstractMastersListener.java:545)
at org.mariadb.jdbc.internal.failover.FailoverProxy.handleFailOver(FailoverProxy.java:367)
at org.mariadb.jdbc.internal.failover.FailoverProxy.invoke(FailoverProxy.java:238)
at com.sun.proxy.$Proxy13.executePreparedQuery(Unknown Source)
at org.mariadb.jdbc.ServerSidePreparedStatement.executeInternal(ServerSidePreparedStatement.java:425)
... 26 more
Caused by: java.sql.SQLNonTransientConnectionException: Read timed out
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.handleIoException(AbstractQueryProtocol.java:1925)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.java:1437)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.getResult(AbstractQueryProtocol.java:1415)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.executePreparedQuery(AbstractQueryProtocol.java:1050)
at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.mariadb.jdbc.internal.failover.AbstractMastersListener.invoke(AbstractMastersListener.java:401)
at org.mariadb.jdbc.internal.failover.FailoverProxy.invoke(FailoverProxy.java:233)
... 28 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.io.FilterInputStream.read(FilterInputStream.java:133)
at org.mariadb.jdbc.internal.io.input.ReadAheadBufferedStream.fillBuffer(ReadAheadBufferedStream.java:130)
at org.mariadb.jdbc.internal.io.input.ReadAheadBufferedStream.read(ReadAheadBufferedStream.java:103)
at org.mariadb.jdbc.internal.io.input.StandardPacketInputStream.getPacketArray(StandardPacketInputStream.java:244)
at org.mariadb.jdbc.internal.io.input.StandardPacketInputStream.getPacket(StandardPacketInputStream.java:215)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.java:1435)

And then, on any attempt to reconnect:
java.lang.NullPointerException
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.setHostAddress(AbstractConnectProtocol.java:1168)
at org.mariadb.jdbc.internal.protocol.AuroraProtocol.loop(AuroraProtocol.java:166)
at org.mariadb.jdbc.internal.failover.impl.AuroraListener.reconnectFailedConnection(AuroraListener.java:210)
at org.mariadb.jdbc.internal.failover.impl.MastersSlavesListener.initializeConnection(MastersSlavesListener.java:170)
at org.mariadb.jdbc.internal.failover.FailoverProxy.<init>(FailoverProxy.java:116)
at org.mariadb.jdbc.internal.util.Utils.retrieveProxy(Utils.java:543)
at org.mariadb.jdbc.MariaDbConnection.newConnection(MariaDbConnection.java:175)
at org.mariadb.jdbc.MariaDbDataSource.getConnection(MariaDbDataSource.java:288)
at org.mariadb.jdbc.MariaDbDataSource.getPooledConnection(MariaDbDataSource.java:451)

This is happening on 90% of failover cases and it requires application restart as the driver does not recover from this state.

Thanks,
Ionut