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SyntaxError: Unmatched selector

See original GitHub issue

I’m getting the following error while selecting an element:

SyntaxError: Unmatched selector:  .et_social_all_button i.et_social_icon.et_social_icon_all_button
        at parse (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/css-what/index.js:85:9)
        at compileUnsafe (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/css-select/lib/compile.js:31:14)
        at select (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/css-select/index.js:18:49)
        at CSSselect (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/css-select/index.js:41:9)
        at initialize.exports.find (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/cheerio/lib/api/traversing.js:40:21)
        at initialize.module.exports (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/cheerio/lib/cheerio.js:88:18)
        at new initialize (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/cheerio/lib/static.js:34:20)
        at initialize (/Users/gijo/Desktop/workspace/flying-press-optimizer/node_modules/cheerio/lib/static.js:31:14)
        at /Users/gijo/Desktop/workspace/flying-press-optimizer/src/optimizer/css/get-used-css.js:65:18
        at Array.filter (<anonymous>)

The selector syntax .et_social_all_button i.et_social_icon.et_social_icon_all_button seems to be valid. But what could be the reason for this error?