I think it's a bug between node-red and dashboard.
I fixed dashboard app.min.js file to solve undefined problem.
Download this file - https://github.com/martinLim45/share/blob/master/app.min.js
and replace node_modules/node-red-dashboard/dist/js/app.min.js.
Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
The OpenJS Foundation | Terms of Use | Privacy Policy | OpenJS Foundation Bylaws | Trademark Policy | Trademark List | Cookie Policy