Index: grails-app/services/com/lemans/ds/solr/SolrQueryService.groovy
===================================================================
diff -u -r9bf9c0b480ef21079c43a68c06da204814f95c70 -ra12b886a73efe5a5fed0cfe32443ebff58bfe795
--- grails-app/services/com/lemans/ds/solr/SolrQueryService.groovy	(.../SolrQueryService.groovy)	(revision 9bf9c0b480ef21079c43a68c06da204814f95c70)
+++ grails-app/services/com/lemans/ds/solr/SolrQueryService.groovy	(.../SolrQueryService.groovy)	(revision a12b886a73efe5a5fed0cfe32443ebff58bfe795)
@@ -694,8 +694,8 @@
         List<SimpleOrderedMap> buckets =  uniqueVals?.get('buckets')
 
         List values = populateCardinalityValuesForDate(buckets, missing, payload)
-        Optional<Map<String, Object>> optionalResult = values.stream()
-                .max{ obj1, obj2 -> obj1.date.compareTo(obj2.date) }.orElse(null)
+        Optional<Map<String, Object>> optionalResult = values?.stream()
+                ?.max{ obj1, obj2 -> obj1.date.compareTo(obj2.date) }.orElse(null)
         Date totalDate = optionalResult.isPresent() ? optionalResult.get()['date'] : null
         [type: payload.queueType.name(), displayName: payload.queueType.value, drillDowns: values ?: [], date: totalDate]
     }