diff --git a/app/models/auth_source_ldap.rb b/app/models/auth_source_ldap.rb
index 696d6219d..b18b657b0 100644
--- a/app/models/auth_source_ldap.rb
+++ b/app/models/auth_source_ldap.rb
@@ -198,7 +198,7 @@ class AuthSourceLdap < AuthSource
   def self.get_attr(entry, attr_name)
     if !attr_name.blank?
       value = entry[attr_name].is_a?(Array) ? entry[attr_name].first : entry[attr_name]
-      value.force_encoding('UTF-8')
+      value.to_s.force_encoding('UTF-8')
     end
   end
 end