slice of undefined

[edwinheij]

Thank you for your great work.

I've got 1 issue: Error in nextTick: "TypeError: Cannot read property 'slice' of undefined"

app.js:2850 TypeError: Cannot read property 'slice' of undefined
    at VueComponent.createNodeMap (app.js:52695)
    at VueComponent.<anonymous> (app.js:52802)
    at Array.<anonymous> (app.js:2946)
    at flushCallbacks (app.js:2867)

<b-tree-view
   :data="cats"
   :nodesDraggable="false"
   :showIcons="false"
   :contextMenu="false"
   :renameNodeOnDblClick="false"
   :contextMenuItems="[]"
   @nodeSelect="nodeSelect"
></b-tree-view>

This is my data:

You know why? Thanks in advance.