Error ds.field_ui.inc

I enabled DS 7.x-2.6+26 and 7.x-2.6+29-dev, no problem, but when i go to manage presentation, in full content and check one ds design, it doesn't works and display this notice:

Notice: Undefined index: additional_settings in ds_field_ui_layouts_save() (line 638 de ./sites/all/modules/ds/includes/ds.field_ui.inc).

Anybody knows any solution or patch or what happens.

Thanks.