Notice: Undefined variable

I am getting this in the modal edit box, below the error the valid data entry. Is this a bug or something missing?

Notice: Undefined variable: required in slickgrid_editor_form() (line 538 of /home/quickstart/websites/idealtest.dev/sites/all/modules/slickgrid/slickgrid.module).
Notice: Undefined variable: required in slickgrid_editor_form() (line 538 of /home/quickstart/websites/idealtest.dev/sites/all/modules/slickgrid/slickgrid.module). =>

... (Array, 13 elements)
Krumo version 0.2.1a
| http://krumo.sourceforge.net
[Click to expand. Double-click to show path.] Called from /home/quickstart/websites/idealtest.dev/sites/all/modules/slickgrid/slickgrid.module, line 538