Runtime error in markup with attrs in checklists

[d3m1d0v]

Markdown markup:

[ ] checklist {#class}

When call transform() and pass this markup and checkbox-plugin, a runtime error occurs:

Uncaught TypeError: Cannot read properties of undefined (reading 'type')
    at push../node_modules/markdown-it-attrs/utils.js.exports.getMatchingOpeningToken (utils.js:236:1)
    at Object.transform (patterns.js:328:1)
    at Array.curlyAttrs (index.js:30:1)
    at push../node_modules/markdown-it/lib/parser_core.js.Core.process (parser_core.js:54:1)
    at push../node_modules/markdown-it/lib/index.js.MarkdownIt.parseInline (index.js:561:1)
    at createTokens (checkbox.js:67:1)
    at splitTextToken (checkbox.js:89:1)
    at Array.<anonymous> (checkbox.js:98:1)
    at push../node_modules/markdown-it/lib/parser_core.js.Core.process (parser_core.js:54:1)
    at push../node_modules/markdown-it/lib/index.js.MarkdownIt.parse (index.js:524:1)