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java.lang.NullPointerException: 	at java.util.TreeMap.getEntry(	at java.util.TreeMap.get(	at org.apache.solr.handler.component.FacetComponent.mergePivotFacet(	at org.apache.solr.handler.component.FacetComponent.countFacets(	at org.apache.solr.handler.component.FacetComponent.handleResponses(	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(	at org.apache.solr.handler.RequestHandlerBase.handleRequest(	at org.apache.solr.core.SolrCore.execute(	at org.apache.solr.servlet.SolrDispatchFilter.execute(	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(