java.lang.NullPointerException: This exception has no message.

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This exception has no message.
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java.lang.NullPointerException:
at java.util.TreeMap.getEntry(TreeMap.java:342)
at java.util.TreeMap.get(TreeMap.java:273)
at org.apache.solr.handler.component.FacetComponent.mergePivotFacet(FacetComponent.java:692)
at org.apache.solr.handler.component.FacetComponent.countFacets(FacetComponent.java:552)
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)

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