"Uncaught TypeError: Cannot read property 'save' of undefined" when creating a new Textbox object

[make2514]

I have encountered the error when using fabric.js version: 1.7.0.
Textbox is working well on fabric.js version: 1.6.7
Here is a jsfiddle for the issue:
https://jsfiddle.net/make2514/26u33c7j/

Any insights would be really appreciated! Thank you very much!

[asturur]

thanks 1.7.0 is fresh of release, there is a new functionality i have to still write docs for.
Getting this bug max priority