diff --git a/src/FilterService/FilterType/ElasticSearch/SelectCategory.php b/src/FilterService/FilterType/ElasticSearch/SelectCategory.php
index 54d53ca14..b7ae82d14 100644
--- a/src/FilterService/FilterType/ElasticSearch/SelectCategory.php
+++ b/src/FilterService/FilterType/ElasticSearch/SelectCategory.php
@@ -70,7 +70,7 @@ public function addCondition(AbstractFilterDefinitionType $filterDefinition, Pro
         } elseif (empty($value) && !$isReload && method_exists($filterDefinition, 'getPreSelect')) {
             $value = $filterDefinition->getPreSelect();
             if ($value instanceof ElementInterface) {
-                $value = $value->getId();
+                $value = (string)$value->getId();
             }
         }