WLSMBeanServerInterceptorBase.getAttribute() has thrown a NullPointerException

We found this prefix in 2 webpages.
MapChildren (2)Typical messages (1)TraceDetailed Map
  1. java.lang.NullPointerException
    1.   at java.util.concurrent.ConcurrentHashMap.get()
    2.   at weblogic.management.mbeanservers.internal.JMXContextInterceptor.getMBeanContextLoader()
    3.   at weblogic.management.mbeanservers.internal.JMXContextInterceptor.getAttribute()
    4.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$12.run()
    5.   at java.security.AccessController.doPrivileged()
    6.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.getAttribute()
    7.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$12.run()
    8.   at java.security.AccessController.doPrivileged()
    9.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.getAttribute()
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MessageNumber of crashes
<No message>2
  1. java.lang.NullPointerException
    1.   at java.util.concurrent.ConcurrentHashMap.get()
    2.   at weblogic.management.mbeanservers.internal.JMXContextInterceptor.getMBeanContextLoader()
    3.   at weblogic.management.mbeanservers.internal.JMXContextInterceptor.getAttribute()
    4.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$12.run()
    5.   at java.security.AccessController.doPrivileged()
    6.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.getAttribute()
    7.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$12.run()
    8.   at java.security.AccessController.doPrivileged()
    9.   at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.getAttribute()