Getting errors " TypeError: Cannot set properties of null (setting 'credentials'): undefined "

From Freshdesk support ticket 296

> Hi, I have an issue with the nr-tool plugin you just release last week. I got these error messages : " TypeError: Cannot set properties of null (setting 'credentials'): undefined " " Request Failed: TypeError: Cannot set properties of null (setting 'credentials') " I tried with different node-red instances, 3 differents raspi, one on windows 10 and one docker, with the same error. Thanks a lot for your help, I'm developping a multiple node-red instance with over 30 raspberry pi for a customer and the troubleshooting part direct on devices before mass deploying is game changer. thanks