diff --git a/app/models/laboratory.rb b/app/models/laboratory.rb
index 53e66ece0..f319ace80 100644
--- a/app/models/laboratory.rb
+++ b/app/models/laboratory.rb
@@ -19,7 +19,7 @@ class Laboratory < ApplicationRecord
     return if subdomain.blank?
 
     rails_env = EduSetting.get('rails_env')
-    subdomain = subdomain.slice(0, subdomain.size - rails_env.size - 1) if subdomain.end_with?(rails_env) # winse.dev => winse
+    subdomain = subdomain.slice(0, subdomain.size - rails_env.size - 1) if rails_env && subdomain.end_with?(rails_env) # winse.dev => winse
 
     find_by_identifier(subdomain)
   end