NullPointerExecption attempting to list all filters for authenticated users

[Jeff Ward]

I'm trying to find all filters that are only assigned to authenticated users using the Adaptavist ScriptRunner plugin. Code is:

def userManager = ComponentManager.getComponentsOfType(JiraAuthenticationContext)?.first()
def currentUser = userManager.getLoggedInUser()

def searchManager = ComponentManager.getComponentsOfType(SearchRequestManager)?.first()

def searchParameter = new SharedEntitySearchParametersBuilder()
        .setSharePermission(new SharePermissionImpl( SharedType.Name.AUTHENTICATED, "", ""))
        .toSearchParameters()

def filters = searchManager.search(searchParameter, currentUser, 0, 50);
log.info("Found ${filters.totalResultCount} filters - fixing")
filters.foreach() {
    log.info("Found: " + it.name);
}

 I'm getting the following NullPointerException:

java.lang.NullPointerException 
  at org.apache.lucene.index.TermInfosReader$CloneableTerm.<init>(TermInfosReader.java:61) 
  at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:218) 
  at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:209) 
  at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:503) 
  at org.apache.lucene.search.TermQuery$TermWeight$1.add(TermQuery.java:56)
  at org.apache.lucene.util.ReaderUtil$Gather.run(ReaderUtil.java:77)
  at org.apache.lucene.util.ReaderUtil$Gather.run(ReaderUtil.java:82)
  at org.apache.lucene.util.ReaderUtil$Gather.run(ReaderUtil.java:66)
  at org.apache.lucene.search.TermQuery$TermWeight.<init>(TermQuery.java:62)
  at org.apache.lucene.search.TermQuery.createWeight(TermQuery.java:198)
  at org.apache.lucene.search.BooleanQuery$BooleanWeight.<init>(BooleanQuery.java:176)
  at org.apache.lucene.search.BooleanQuery.createWeight(BooleanQuery.java:354)
  at org.apache.lucene.search.Searcher.createNormalizedWeight(Searcher.java:168)
  at org.apache.lucene.search.IndexSearcher.createNormalizedWeight(IndexSearcher.java:661)
  at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:370)
  at com.atlassian.jira.index.DelegateSearcher.search(DelegateSearcher.java:137)
  at com.atlassian.jira.sharing.index.DefaultSharedEntitySearcher$1.getHits(DefaultSharedEntitySearcher.java:97)
  at com.atlassian.jira.sharing.index.DefaultSharedEntitySearcher$Engine.search(DefaultSharedEntitySearcher.java:183)
  at com.atlassian.jira.sharing.index.DefaultSharedEntitySearcher.search(DefaultSharedEntitySearcher.java:104)
  at com.atlassian.jira.issue.search.DefaultSearchRequestManager.search(DefaultSearchRequestManager.java:306)
  at com.atlassian.jira.issue.search.SearchRequestManager$search.call(Unknown Source)
  at Script67.fixFilterPermissions(Script67.groovy:35) at Script67.run(Script67.groovy:80)

 JIRA 7.5.0