null pointer in ldap provisioner

Error: Adding entity to group (elapsed: 0:00:00.681)
java.lang.NullPointerException
at edu.internet2.middleware.grouper.app.provisioning.ProvisioningUpdatable.clearAttribute(ProvisioningUpdatable.java:1096)
at edu.internet2.middleware.grouper.app.provisioning.GrouperProvisioningTranslator.translateGrouperToTargetMemberships(GrouperProvisioningTranslator.java:73)
at edu.internet2.middleware.grouper.app.provisioning.GrouperProvisioningDiagnosticsContainer.appendInsertGroupAttributesMembershipIntoTarget(GrouperProvisioningDiagnosticsContainer.java:631)
at edu.internet2.middleware.grouper.app.provisioning.GrouperProvisioningDiagnosticsContainer.runDiagnostics(GrouperProvisioningDiagnosticsContainer.java:211)
at edu.internet2.middleware.grouper.app.provisioning.GrouperProvisioningType$2.provision(GrouperProvisioningType.java:72)
at edu.internet2.middleware.grouper.app.provisioning.GrouperProvisioningLogic.provision(GrouperProvisioningLogic.java:77)
at edu.internet2.middleware.grouper.app.provisioning.GrouperProvisioner.provision(GrouperProvisioner.java:797)
at edu.internet2.middleware.grouper.grouperUi.serviceLogic.UiV2ProvisionerConfiguration$1.callLogic(UiV2ProvisionerConfiguration.java:223)
at edu.internet2.middleware.grouper.grouperUi.serviceLogic.UiV2ProvisionerConfiguration$1.callLogic(UiV2ProvisionerConfiguration.java:218)
at edu.internet2.middleware.grouper.util.GrouperCallable$1.callback(GrouperCallable.java:203)
at edu.internet2.middleware.grouper.GrouperSession.callbackGrouperSession(GrouperSession.java:1000)
at edu.internet2.middleware.grouper.util.GrouperCallable.callLogicWithSessionIfExists(GrouperCallable.java:200)
at edu.internet2.middleware.grouper.util.GrouperCallable.call(GrouperCallable.java:166)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
Note: Debug info: (elapsed: 0:00:00.681)