deprovisioning cache throws NPE after having been running for a while

java.lang.NullPointerExceptionjava.lang.NullPointerException at edu.internet2.middleware.grouper.app.deprovisioning.GrouperDeprovisioningLogic.deprovisionedSubjectsForAffiliation(GrouperDeprovisioningLogic.java:364) at edu.internet2.middleware.grouper.app.deprovisioning.GrouperDeprovisioningLogic.shouldAddSubject(GrouperDeprovisioningLogic.java:894) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType.syncOneGroupMembership(GrouperLoaderType.java:2922) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType$1.runJob(GrouperLoaderType.java:166) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.runJob(GrouperLoaderJob.java:465) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.execute(GrouperLoaderJob.java:345) at org.quartz.core.JobRunShell.run(JobRunShell.java:202) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)penn:community:activeNonAlumniWithPennname processed 94000 records, finding new members to remove, 94000 of 94292 subjects, java.lang.RuntimeException: Problem with group: penn:community:activeNonAlumniWithPennname at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType.syncOneGroupMembership(GrouperLoaderType.java:3140) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType$1.runJob(GrouperLoaderType.java:166) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.runJob(GrouperLoaderJob.java:465) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.execute(GrouperLoaderJob.java:345) at org.quartz.core.JobRunShell.run(JobRunShell.java:202) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)Caused by: java.lang.NullPointerException at edu.internet2.middleware.grouper.app.deprovisioning.GrouperDeprovisioningLogic.deprovisionedSubjectsForAffiliation(GrouperDeprovisioningLogic.java:364) at edu.internet2.middleware.grouper.app.deprovisioning.GrouperDeprovisioningLogic.shouldAddSubject(GrouperDeprovisioningLogic.java:894) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType.syncOneGroupMembership(GrouperLoaderType.java:2922) ... 5 more