TypeError: Cannot read property 'each' of null

[slackero]

I have a CSS file which is processed well in CSSO 2.3.2 while results with error TypeError: Cannot read property 'each' of null in CSSO 3.1.1. Is not working with csso-cli and not online.

styles.css.zip

[lahmatiy]

The problem occur because you're using :not w/o parenthesis on line 9025:

.nav-sidebar .navbar-nav:not {
  display: block;
}

It's a dead code. If you fix it, compression will perform as expected.

Anyway, CSSO should output more useful errors (if any). Need to be improved.

[slackero]

Great, thanks for your fast feedback and help. Works as expected now.

[Nakilon]

$ csso small.css --output tiny.css
/usr/local/lib/node_modules/csso-cli/index.js:299
            throw e;
            ^

TypeError: Cannot read property 'each' of null
    at List.walk (/usr/local/lib/node_modules/csso-cli/node_modules/csso/lib/restructure/prepare/specificity.js:25:39)
    at List.each (/usr/local/lib/node_modules/csso-cli/node_modules/css-tree/lib/common/List.js:158:12)
    at specificity (/usr/local/lib/node_modules/csso-cli/node_modules/csso/lib/restructure/prepare/specificity.js:6:29)
    at List.<anonymous> (/usr/local/lib/node_modules/csso-cli/node_modules/csso/lib/restructure/prepare/processSelector.js:79:40)
    at List.each (/usr/local/lib/node_modules/csso-cli/node_modules/css-tree/lib/common/List.js:158:12)
    at freeze (/usr/local/lib/node_modules/csso-cli/node_modules/csso/lib/restructure/prepare/processSelector.js:25:27)
    at Object.processRule (/usr/local/lib/node_modules/csso-cli/node_modules/csso/lib/restructure/prepare/index.js:14:13)
    at Object.<anonymous> (/usr/local/lib/node_modules/csso-cli/node_modules/css-tree/lib/walker/create.js:11:16)
    at List.walkNode (/usr/local/lib/node_modules/csso-cli/node_modules/css-tree/lib/walker/create.js:161:19)
    at List.each (/usr/local/lib/node_modules/csso-cli/node_modules/css-tree/lib/common/List.js:158:12)

I have the same uninformative error with this file. It's saved Youtube page CSS after UnCSS.

small.css.zip

[usabe]

@Nakilon

On the lines of 1823 and 2571, there are 3 instances of :not without parenthesis, such as : :not[button-raised] & :not[collapsible]

Just came across this when trying to find out the root cause of the same problem.