Steps to reproduce the issue

1. Edit administrator/components/com_banners/config.xml, add required="true" to a text field, for example:

   <field
       required="true"
       name="metakey_prefix"
       type="text"
       label="COM_BANNERS_FIELD_METAKEYWORDPREFIX_LABEL"
       description="COM_BANNERS_FIELD_METAKEYWORDPREFIX_DESC" />
   

2. Go to Banners component, edit it's configuration.

3. Make sure the field in step 1 doesn't have any value. Click Save button on the toolbar, we get error message from validation, eg Invalid field: Meta Keyword Prefix.

4. Click Cancel button on the toolbar to cancel editting.

Expected result

Configuration form is closed.

Actual result

Nothing happens, the form is not closed.

System information

• Joomla! 3.3.6