java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at net.sf.kraken.protocols.yahoo.YahooBuddy.(YahooBuddy.java:27)	at net.sf.kraken.protocols.yahoo.YahooSession.addContact(YahooSession.java:258)	at net.sf.kraken.BaseTransport.interceptPacket(BaseTransport.java:2507)	at org.jivesoftware.openfire.interceptor.InterceptorManager.invokeInterceptors(InterceptorManager.java:228)	at org.jivesoftware.openfire.IQRouter.route(IQRouter.java:110)	at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:68)	at org.jivesoftware.openfire.net.StanzaHandler.processIQ(StanzaHandler.java:319)	at org.jivesoftware.openfire.net.ClientStanzaHandler.processIQ(ClientStanzaHandler.java:79)	at org.jivesoftware.openfire.net.StanzaHandler.process(StanzaHandler.java:284)	at org.jivesoftware.openfire.net.StanzaHandler.process(StanzaHandler.java:176)	at org.jivesoftware.openfire.nio.ConnectionHandler.messageReceived(ConnectionHandler.java:133)	at org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.messageReceived(AbstractIoFilterChain.java:570)	at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)	at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilterChain.java:53)	at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:648)	at org.apache.mina.common.IoFilterAdapter.messageReceived(IoFilterAdapter.java:80)	at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)	at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilterChain.java:53)	at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:648)	at org.apache.mina.filter.codec.support.SimpleProtocolDecoderOutput.flush(SimpleProtocolDecoderOutput.java:58)	at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:185)	at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)	at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilterChain.java:53)	at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:648)	at org.apache.mina.filter.executor.ExecutorFilter.processEvent(ExecutorFilter.java:239)	at org.apache.mina.filter.executor.ExecutorFilter$ProcessEventsRunnable.run(ExecutorFilter.java:283)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)	at java.lang.Thread.run(Thread.java:619)