Uncaught Error: Not supported: reassigning object that already occurs in the tree.

I have a simple todo app written in Vue
I want to enable the user to sort the todos and move them from on list to the other.
I'm using https://sortablejs.github.io/vue.draggable.next

Here is a link to my repository
https://github.com/giladl82/collab-todo

Thank you

