diff --git a/app/views/api/v1/issues/_detail.json.jbuilder b/app/views/api/v1/issues/_detail.json.jbuilder
index 712e7a960..7c3adecc3 100644
--- a/app/views/api/v1/issues/_detail.json.jbuilder
+++ b/app/views/api/v1/issues/_detail.json.jbuilder
@@ -1,5 +1,5 @@
 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.blockchain_token_num (Site.has_blockchain? && 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 4f288ce20..8b4bb6af3 100644
--- a/app/views/api/v1/issues/_simple_detail.json.jbuilder
+++ b/app/views/api/v1/issues/_simple_detail.json.jbuilder
@@ -1,5 +1,5 @@
 json.(issue, :id, :subject, :project_issues_index)
-json.blockchain_token_num issue.project&.use_blockchain ? issue.blockchain_token_num : nil
+json.blockchain_token_num (Site.has_blockchain? && 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|