[postcss-custom-properties] TypeError: Cannot read properties of undefined (reading 'nodes')

[Hypnosphi]

Reproduction link

https://github.com/Hypnosphi/postcss-custom-properties-repro

Bug description

Postcss crashes with an exception

Actual Behavior

No response

Expected Behavior

No response

Can you reproduce it with npx @csstools/csstools-cli <plugin-name> minimal-example.css?

Yes

npx Output

given the following css

.grid {
    --column-width: auto;
    --first-column: [start] var(--column-width);

    grid-template-columns: var(--first-column) auto;
}

the output is

Cannot read properties of undefined (reading 'nodes')

Inlining any of the vars or moving [start] fixes the issue

Extra config

No response

What plugin are you experiencing this issue on?

PostCSS Custom Properties

Plugin version

13.1.3

What OS are you experiencing this on?

macOS

Node Version

18.13.0

Validations

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Would you like to open a PR for this bug?

• I'm willing to open a PR

[romainmenke]

Hi @Hypnosphi,

Thank you for reaching out and for the detailed description and repro.
This was extremely helpful 🙇

We've identified the cause and will try to release a fix as soon as possible.

[romainmenke]

@Hypnosphi We have just released an updated version that should resolve your issues.
Thank you again for reporting this!