OSB: com.bea.alsb.alert.log.LocalAlertLogger NullPointerException

We have noticed that when 2 different users access sbconsole at the same time, we have a NullPointerException in a Managed server:

RuntimeException thrown by rmi server: com.bea.alsb.alert.log.LocalAlertLogger.next(Ljava.lang.String;I)
java.lang.NullPointerException.
java.lang.NullPointerException
at com.bea.alsb.alert.log.LocalAlertLogger.next(LocalAlertLogger.java:182)
at com.bea.alsb.alert.log.LocalAlertLogger_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:667)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:522)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:146)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:518)
at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

This is not a harmful thing, although not desirable.