diff --git a/controllers/home_controller.rb b/controllers/home_controller.rb
index 459c6a4f..c2a67fb4 100644
--- a/controllers/home_controller.rb
+++ b/controllers/home_controller.rb
@@ -121,7 +121,7 @@ def metadata_all
               unique: cls.unique?(attribute) || " ",
               required: cls.required?(attribute) || " ",
               list: cls.list?(attribute) || " ",
-              cardinality: cls.cardinality(attribute) || " "
+              cardinality: (cls.cardinality(attribute) rescue nil) || " "
             }
           else
             attributes_info[attribute] = {