Undefined index: max_length in autocomplete_widgets_field_widget_form()

Hi,
First, thanks for this module, I would have become crazy trying to make an autocomplete field by myself...

Then, when I created my first autocomplete field, just after having submited the field settings (first field creation form), I get this error message :
Notice: Undefined index: max_length in autocomplete_widgets_field_widget_form() (line 126 of [...]\modules\autocomplete_widgets\autocomplete_widgets.module).

Anyway, this message dosen't bug the module : the autocomplete field works, but the message is present everywhere the field is visible.

Thanks for all.