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-rw-r--r--actionpack/lib/action_view/helpers/form_helper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 5cfcfdd8d5..5dc5bb8a98 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -423,6 +423,7 @@ module ActionView
object = nil
else
object = record.is_a?(Array) ? record.last : record
+ raise ArgumentError, "First argument in form cannot contain nil or be empty" if object.blank?
object_name = options[:as] || model_name_from_record_or_class(object).param_key
apply_form_for_options!(record, object, options)
end