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java.lang.NullPointerException: 	at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:1115)	at org.apache.solr.handler.component.QueryComponent.handleRegularResponses(QueryComponent.java:759)	at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:738)	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:426)	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:156)	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2036)	at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:657)	at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:464)	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:257)	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:208)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)	at org.eclipse.jetty.server.Server.handle(Server.java:518)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)