null pointer on subject cache

java.lang.NullPointerExceptionjava.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936) at edu.internet2.middleware.grouper.subj.cache.SubjectSourceCache.updateSubjectInCache(SubjectSourceCache.java:984) at edu.internet2.middleware.grouper.subj.cache.SubjectSourceCache.getSubjectsByIdsFromCacheOrSource(SubjectSourceCache.java:1402) at edu.internet2.middleware.grouper.subj.SourcesXmlResolver.findByIds(SourcesXmlResolver.java:1101) at edu.internet2.middleware.grouper.subj.CachingResolver.findByIds(CachingResolver.java:958) at edu.internet2.middleware.grouper.subj.ValidatingResolver.findByIds(ValidatingResolver.java:314) at edu.internet2.middleware.grouper.SubjectFinder.findByIds(SubjectFinder.java:1594) at edu.internet2.middleware.grouper.app.loader.db.GrouperLoaderResultset.bulkLookupSubjects(GrouperLoaderResultset.java:172) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderType$4.runJob(GrouperLoaderType.java:442) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.runJob(GrouperLoaderJob.java:465) at edu.internet2.middleware.grouper.app.loader.GrouperLoaderJob.execute(GrouperLoaderJob.java:345) at org.quartz.core.JobRunShell.run(JobRunShell.java:202) at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)