Cannot read property 'attr' of null

[zimbolis]

Hi, this happened when trying to convert an svg:

/usr/local/lib/node_modules/smil2css/lib/convert.js:18
var style = _data.target.attr("style");
^

TypeError: Cannot read property 'attr' of null
at appendAnimationToShapes (/usr/local/lib/node_modules/smil2css/lib/convert.js:18:27)
at module.exports (/usr/local/lib/node_modules/smil2css/lib/convert.js:70:2)
at smil2css.convert (/usr/local/lib/node_modules/smil2css/lib/index.js:55:4)
at Function.smil2css.convert (/usr/local/lib/node_modules/smil2css/lib/index.js:30:18)
at module.exports (/usr/local/lib/node_modules/smil2css/lib/cli.js:192:36)
at Object. (/usr/local/lib/node_modules/smil2css/bin/index:3:22)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12) input.svg --/Users/user/Desktop/output.svg -c