diff --git a/apis_ontology/api/serializers.py b/apis_ontology/api/serializers.py
index 6ec2ea0..39a1077 100644
--- a/apis_ontology/api/serializers.py
+++ b/apis_ontology/api/serializers.py
@@ -41,7 +41,7 @@ class Meta:
 
 class WorkPreviewSerializer(serializers.ModelSerializer):
     expression_data = ExpressionDataSerializer(required=False, many=True)
-    work_type = WorkTypeDataSerializer(required=False, allow_null=True)
+    work_type = WorkTypeDataSerializer(required=False, allow_empty=True, many=True)
 
     class Meta:
         model = Work
diff --git a/apis_ontology/api/views.py b/apis_ontology/api/views.py
index 2b9d2c5..81f04ea 100644
--- a/apis_ontology/api/views.py
+++ b/apis_ontology/api/views.py
@@ -107,7 +107,7 @@ def get_queryset(self):
                         )
                     )
                 ),
-                work_type=Subquery(
+                work_type=ArraySubquery(
                     work_types.values(
                         json=JSONObject(
                             name="name",