Hi we are getting Nullpointer exception in synchronous interface

Hi

We are getting error Null pointer exception in Synchronous interface in 'To be delivered' state in Adapter engine -> Database -> To be delivered.

Error : Putting message into receive queue failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: Could not queue receive for message (INBOUND). Reason: java.lang.NullPointerException: while trying to invoke the method java.lang.Object.toString() of a null object returned from com.sap.aii.af.sdk.xi.mo.xmb.XMBMessageOperator.getMessageId(com.sap.aii.af.sdk.xi.mo.Message).

We migrated from PI7.1 to PI7.4 dual stack.

Please share your thoughts .

Regards

Pavan.