Error from ValuesEmulatorget

Hello everyone,

Everytime rebooting the TN, I received the following error in error.log:
java.lang.NullPointerException
at com.wm.data.ValuesEmulator.get(ValuesEmulator.java:20)
at com.wm.app.tn.delivery.RoutingJob.getDBIData(RoutingJob.java:177)
at com.wm.app.tn.db.DeliveryOperations.changeJob(DeliveryOperations.java:454)
at com.wm.app.tn.db.DeliveryStore.updateJob(DeliveryStore.java:530)
at com.wm.app.tn.delivery.GuaranteedJob.save(GuaranteedJob.java:960)
at com.wm.app.tn.delivery.GuaranteedJob.invoke(GuaranteedJob.java:281)
at com.wm.app.tn.delivery.JobMgr$JobExecutor.run(JobMgr.java:970)
at com.wm.util.pool.PooledThread.run(C:/NT/Perforce/basis/4.1.0-terra/module/core/source/com/wm/util/pool/PooledThread.java:103)

Do you have any idea about this error?

Thanks
Binh