Validation fails when LSP used with Kate on Arch

[vzsolt1981]

LSP Log (from Kate)

[12:57:03  LSP Server Log] scss@/home/zsolt
[Error] Error while validating file:///<...>/app/layout/user/user-layout.component.scss: Cannot read properties of null (reading 'validProperties')
TypeError: Cannot read properties of null (reading 'validProperties')
    at LintConfigurationSettings.getSetting (/usr/lib/node_modules/vscode-css-languageserver/node_modules/vscode-css-languageservice/lib/umd/services/lintRules.js:78:29)
    at new LintVisitor (/usr/lib/node_modules/vscode-css-languageserver/node_modules/vscode-css-languageservice/lib/umd/services/lint.js:53:41)
    at LintVisitor.entries (/usr/lib/node_modules/vscode-css-languageserver/node_modules/vscode-css-languageservice/lib/umd/services/lint.js:41:29)
    at CSSValidation.doValidation (/usr/lib/node_modules/vscode-css-languageserver/node_modules/vscode-css-languageservice/lib/umd/services/cssValidation.js:34:60)
    at validateTextDocument (/usr/lib/node_modules/vscode-css-languageserver/out/cssServer.js:151:49)
    at async Timeout._onTimeout (/usr/lib/node_modules/vscode-css-languageserver/out/utils/validation.js:37:41)

System

Kernel

• 6.18.1-arch1-2

Used packages

• nodejs 25.2.1-1
• kate 25.12.0-1
• vscode-css-languageserver 1.107.0-1

Edit: I've found this, might be related.