diff --git a/app/views/examination_banks/show.json.jbuilder b/app/views/examination_banks/show.json.jbuilder
index 187e89cc2..eed1b2407 100644
--- a/app/views/examination_banks/show.json.jbuilder
+++ b/app/views/examination_banks/show.json.jbuilder
@@ -45,7 +45,9 @@ json.exam do
     end
   end
   json.sub_discipline do
-    json.(@exam.sub_discipline, :id, :name)
+    if @exam.sub_discipline.present?
+      json.(@exam.sub_discipline, :id, :name)
+    end
   end
   json.tag_disciplines @exam.tag_disciplines do |tag|
     json.(tag, :id, :name)