org.apache.solr.client.solrj.SolrServerException: org.apache.solr.client.solrj.SolrServerException: java.lang.NullPointerException
	at org.apache.solr.client.solrj.embedded.EmbeddedSolrServer.request(EmbeddedSolrServer.java:233)
	at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:194)
	at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:974)
	at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:990)
	at org.ametys.solr.AclTestCase.testReloadCache(AclTestCase.java:122)
Caused by: org.apache.solr.client.solrj.SolrServerException: java.lang.NullPointerException
	at org.apache.solr.client.solrj.embedded.EmbeddedSolrServer.checkForExceptions(EmbeddedSolrServer.java:301)
	at org.apache.solr.client.solrj.embedded.EmbeddedSolrServer.request(EmbeddedSolrServer.java:192)
Caused by: java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
	at org.ametys.solr.helper.AclCacheManager.computeAllowedUsers(AclCacheManager.java:315)
	at org.ametys.solr.handler.ReloadAclCacheHandler._fillCacheForSegment(ReloadAclCacheHandler.java:233)
	at org.ametys.solr.handler.ReloadAclCacheHandler._fill(ReloadAclCacheHandler.java:217)
	at org.ametys.solr.handler.ReloadAclCacheHandler.handleRequestBody(ReloadAclCacheHandler.java:102)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2541)
	at org.apache.solr.client.solrj.embedded.EmbeddedSolrServer.request(EmbeddedSolrServer.java:191)