warning: illegal offset type in widgets.php (text)

When I add the Text Widget to the sidebar (or anywhere), i get this warning for lines 34 35 and 36:

illegal offset type in plugins/semiologic/admin/widgets.php

It’s behaving weirdly too, disappearing even when i click “Change” in the widget and then “Save Changes” below.

If Notepad++ didn’t re-number the lines, this is the code in question:

34 $title = attribute_escape($options[$number]['title']);
35 $text = format_to_edit($options[$number]['text']);
36 $filter = (bool) $options[$number]['filter'];

thanks in advance for help