NPE: When CANCEL a call

When I call an user but I cancel the call before the called user accepts I
receive a NullPointerException:

19:26:53,687 INFO  [STDOUT] Exception in thread "UDPMessageChannelThread"
19:26:53,703 INFO  [STDOUT] java.lang.NullPointerException
19:26:53,703 INFO  [STDOUT]     at
gov.nist.javax.sip.stack.SIPServerTransaction
.setDialog(SIPServerTransaction.java:1220)
19:26:53,718 INFO  [STDOUT]     at
gov.nist.javax.sip.NistSipMessageHandlerImpl.
processRequest(NistSipMessageHandlerImpl.java:264)
19:26:53,734 INFO  [STDOUT]     at
gov.nist.javax.sip.stack.SIPServerTransaction
.processRequest(SIPServerTransaction.java:687)
19:26:53,734 INFO  [STDOUT]     at
gov.nist.javax.sip.stack.UDPMessageChannel.ru
n(UDPMessageChannel.java:382)
19:26:53,750 INFO  [STDOUT]     at java.lang.Thread.run(Thread.java:595)
19:26:58,968 INFO  [SbbEntity] invoking event handler onTimerEvent on
org.mobice
nts.slee.services.sip.proxy.JainSipProxySbbImpl ID SbbID[ProxySbb#NIST#1.0]
sbbE
ntity org.mobicents.slee.runtime.SbbEntity@bd630e currentEvent
SleeEventImpl.toS
tring() = {

*****************************

I think that the problem is in the
gov.nist.javax.sip.NistSipMessageHandlerImpl (Line 264)

transaction.setDialog((SIPDialog) st.getDialog(), sipRequest);

If the st.getDialog() returns null the setDialog is called with arg0= null
->   SIPServerTransaction (Line 1218):

    public void setDialog(SIPDialog sipDialog, SIPMessage sipMessage) {
        this.dialog = sipDialog;
        this.dialog.setAssigned();    ----->>> NullPointerException!!!!!!!!


Regards,

Victor

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