diff --git a/app/views/api/v1/issues/_detail.json.jbuilder b/app/views/api/v1/issues/_detail.json.jbuilder
index d1b6352c7..83e83d981 100644
--- a/app/views/api/v1/issues/_detail.json.jbuilder
+++ b/app/views/api/v1/issues/_detail.json.jbuilder
@@ -1,4 +1,5 @@
-json.(issue, :id, :subject, :project_issues_index, :description, :branch_name, :start_date, :due_date, :blockchain_token_num)
+json.(issue, :id, :subject, :project_issues_index, :description, :branch_name, :start_date, :due_date)
+json.blockchain_token_num issue.project&.use_blockchain ? issue.blockchain_token_num : nil
 json.created_at issue.created_on.strftime("%Y-%m-%d %H:%M")
 json.updated_at issue.updated_on.strftime("%Y-%m-%d %H:%M")
 json.tags issue.show_issue_tags.each do |tag|
diff --git a/app/views/api/v1/issues/_simple_detail.json.jbuilder b/app/views/api/v1/issues/_simple_detail.json.jbuilder
index 27424deff..4f288ce20 100644
--- a/app/views/api/v1/issues/_simple_detail.json.jbuilder
+++ b/app/views/api/v1/issues/_simple_detail.json.jbuilder
@@ -1,4 +1,5 @@
-json.(issue, :id, :subject, :project_issues_index, :blockchain_token_num)
+json.(issue, :id, :subject, :project_issues_index)
+json.blockchain_token_num issue.project&.use_blockchain ? issue.blockchain_token_num : nil
 json.created_at issue.created_on.strftime("%Y-%m-%d %H:%M")
 json.updated_at issue.updated_on.strftime("%Y-%m-%d %H:%M")
 json.tags issue.show_issue_tags.each do |tag|