TypeError: Cannot read property 'transform' of undefined

[gtoal]

I installed with "sudo npm install -g vectorinox" and it seemed to install OK, but on using it I get:

$ vectorinox --stdout youtube.svg
/usr/local/lib/node_modules/vectorinox/dist/plugins/applyTransforms.js:292
    if (el.attrs['transform']) {
                ^

TypeError: Cannot read property 'transform' of undefined
    at applyTransforms (/usr/local/lib/node_modules/vectorinox/dist/plugins/applyTransforms.js:292:17)
    at Array.map (<anonymous>)
    at applyTransforms (/usr/local/lib/node_modules/vectorinox/dist/plugins/applyTransforms.js:305:35)
    at Array.map (<anonymous>)
    at applyTransforms (/usr/local/lib/node_modules/vectorinox/dist/plugins/applyTransforms.js:305:35)
    at /usr/local/lib/node_modules/vectorinox/dist/index.js:25:72
    at Array.reduce (<anonymous>)
    at Object.clean (/usr/local/lib/node_modules/vectorinox/dist/index.js:25:22)
    at Object.<anonymous> (/usr/local/lib/node_modules/vectorinox/dist/bin.js:95:19)
    at Module._compile (module.js:652:30)

I get the same error whether there is a transform="..." anywhere in the svg file or not.

Sorry I can't help debug, not familiar with the language. I just need a command line utility to flatten svg files for use with a project I'm writing in C.