diff --git a/src/server/sparql/SparqlQueriesGeneral.js b/src/server/sparql/SparqlQueriesGeneral.js
index 43e42bbb50cf87081dc6db3f63f2e81262bef903..ed67c87d0e3d8388b00bac86d45cbd1852b8844d 100644
--- a/src/server/sparql/SparqlQueriesGeneral.js
+++ b/src/server/sparql/SparqlQueriesGeneral.js
@@ -36,7 +36,7 @@ export const facetResultSetQuery = `
       SELECT DISTINCT ?id {
         <FILTER>
         ?id a <RDF_TYPE> .
-        ?id <ORDER_BY_PREDICATE> ?orderBy .
+        OPTIONAL { ?id <ORDER_BY_PREDICATE> ?orderBy }
       }
       ORDER BY (!BOUND(?orderBy)) <SORT_DIRECTION>(?orderBy)
       <PAGE>