Teaser break doesn't work in CK Editor (data.node = null)

Hi.
I want report bug in CK Editor javascript interface.

Teaser break button doesn't work and generate error
at file: editors/js/ckeditor-3.0.js, line: 186

See my screenshots for more info.

Tested on the:

Wysiwyg-6.x-2.2
CK Editor 3.5.0.6260

Thanks for help.
Peter.