diff --git a/lib/action_view/helpers/dynamic_form.rb b/lib/action_view/helpers/dynamic_form.rb
index f127ff9..e2d2a22 100644
--- a/lib/action_view/helpers/dynamic_form.rb
+++ b/lib/action_view/helpers/dynamic_form.rb
@@ -221,12 +221,12 @@ def error_messages_for(*params)
 
             message = options.include?(:message) ? options[:message] : locale.t(:body)
 
-            error_messages = objects.sum do |object|
-              object.errors.full_messages.map do |msg|
+            error_messages = []
+              objects.each do |object|
+              error_messages = object.errors.full_messages.map do |msg|
                 content_tag(:li, msg)
-              end
-            end.join.html_safe
-
+              end.join.html_safe
+            end
             contents = ''
             contents << content_tag(options[:header_tag] || :h2, header_message) unless header_message.blank?
             contents << content_tag(:p, message) unless message.blank?