diff --git a/app/views/project_rank/_detail.json.jbuilder b/app/views/project_rank/_detail.json.jbuilder
index d5b4b016b..c083033e1 100644
--- a/app/views/project_rank/_detail.json.jbuilder
+++ b/app/views/project_rank/_detail.json.jbuilder
@@ -3,8 +3,8 @@ owner_common = $redis_cache.hgetall("v2-owner-common:#{project_common["owner_id"
 json.id item[0]
 json.score item[1]
 json.name project_common["name"]
-if project_common['identifier'].include?("/")
-  json.identifier project_common["identifier"].split('/')[1]
+if project_common['identifier'].to_s.include?("/")
+  json.identifier project_common["identifier"].to_s.split('/')[1]
   json.owner do 
     json.id nil
     json.type 'User'