diff --git a/app/models/GQLSchema.scala b/app/models/GQLSchema.scala
index c90a8ba1..bbeba4dd 100644
--- a/app/models/GQLSchema.scala
+++ b/app/models/GQLSchema.scala
@@ -93,10 +93,11 @@ object GQLSchema {
         "facets",
         searchFacetsResultsGQLImp,
         description = Some("Search facets"),
-        arguments = queryString :: entityNames :: pageArg :: Nil,
+        arguments = optQueryString :: entityNames :: pageArg :: Nil,
         resolve = ctx => {
+          val queryString = ctx.arg(optQueryString).getOrElse("")
           val entities = ctx.arg(entityNames).getOrElse(Seq.empty)
-          ctx.ctx.searchFacets(ctx.arg(queryString), ctx.arg(pageArg), entities)
+          ctx.ctx.searchFacets(queryString, ctx.arg(pageArg), entities)
         }
       ),
       Field(