java.lang.NullPointerException: org.hibernate.search.util.impl.SoftLimitMRUCachedoes not support null key [_0(4.6):c1] or value [null]
	at org.hibernate.search.util.impl.SoftLimitMRUCache.put(SoftLimitMRUCache.java:154)
	at org.hibernate.search.filter.impl.CachingWrapperFilter.getDocIdSet(CachingWrapperFilter.java:99)
	at org.hibernate.search.filter.impl.ChainedFilter.getDocIdSet(ChainedFilter.java:86)
	at org.apache.lucene.search.FilteredQuery$1.scorer(FilteredQuery.java:128)
	at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:618)
	at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:297)
	at org.hibernate.search.query.engine.impl.LazyQueryState.search(LazyQueryState.java:99)
	at org.hibernate.search.query.engine.impl.QueryHits.updateTopDocs(QueryHits.java:244)
	at org.hibernate.search.query.engine.impl.QueryHits.<init>(QueryHits.java:139)
	at org.hibernate.search.query.engine.impl.HSQueryImpl.getQueryHits(HSQueryImpl.java:463)
	at org.hibernate.search.query.engine.impl.HSQueryImpl.queryResultSize(HSQueryImpl.java:350)