rootNode null when viewing SVG file

[matthewlein]

With devtools open, you can see the error https://upload.wikimedia.org/wikipedia/commons/0/02/SVG_logo.svg

if (!rootNode) { return; } would probably get 'er done quick and dirty.

[PythonCoderAS]

Yes it is a problem.

Uncaught TypeError: Cannot read property 'nodeType' of null
    at walk (content_script.js:10)
    at content_script.js:1

content_script.js:4 Uncaught TypeError: Failed to execute 'createTreeWalker' on 'Document': parameter 1 is not of type 'Node'.
    at walk (content_script.js:4)
    at walkAndObserve (content_script.js:288)
    at content_script.js:301