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

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java.lang.NullPointerException:
at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:903)
at org.apache.solr.handler.component.QueryComponent.handleRegularResponses(QueryComponent.java:649)
at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:628)
at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:311)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1850)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:703)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:406)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

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