Crash on Internet explorer and webkit

Hello

i got crash on some web browser because of a coma

 var renderer = assign({
        raw: '',
        pfx: '_',
        client: client,
        assign: assign,
        stringify: JSON.stringify,
        kebab: function (prop) {
            return prop.replace(KEBAB_REGEX, '-$&').toLowerCase();
        },
        decl: function (key, value) {
            key = renderer.kebab(key);
            return key + ':' + value + ';';
        },
        hash: function (obj) {
            return hash(renderer.stringify(obj));
        },
        selector: function (parent, selector) {
            return parent + (selector[0] === ':' ? ''  : ' ') + selector;
        },
        putRaw: function (rawCssRule) {
            renderer.raw += rawCssRule;
        },         <-----------------------------------------
    }, config);

i there a way to get a fix please removing this useless coma? thanks

streamich / nano-css

Crash on Internet explorer and webkit #246