Extensions - Modify path - Fractalize

Steps to reproduce:

Create rectangle and object to path. Select nodes on one side and add 3 extra sets of nodes Select Extensions - Modify path - Fractalize Select "Live preview" Error message

<--- Error message is pasted in the svg file attatched -->

What happened?

See attached file

What should have happened?

Added nodes and re-shaping.

Inkscape Version and Operating System:

• Inkscape Version: ... 1 Alpha
• Operating System: Windows 7
• Operating System version: ...