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java.lang.NullPointerException: 	at java.util.TreeMap.compare(TreeMap.java:1188)	at java.util.TreeMap.put(TreeMap.java:531)	at org.apache.solr.handler.component.PivotFacetHelper.convertPivotsToMaps(PivotFacetHelper.java:317)	at org.apache.solr.handler.component.FacetComponent.countFacets(FacetComponent.java:542)	at org.apache.solr.handler.component.FacetComponent.handleResponses(FacetComponent.java:336)	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:309)	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:144)	at org.apache.solr.core.SolrCore.execute(SolrCore.java:1830)	at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:455)	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:276)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1337)