Error on bench start while compiling page.less

ERPNext
1

Hi there, an error is raised on bench start when it try to compile page.less:

08:38:16 watch.1          | Error compiling  page.less
08:38:16 watch.1          | { [Error: Unrecognised input. Possibly missing opening '{']
08:38:16 watch.1          |   type: 'Parse',
08:38:16 watch.1          |   filename: 'page.less',
08:38:16 watch.1          |   index: 4685,
08:38:16 watch.1          |   line: 329,
08:38:16 watch.1          |   callLine: NaN,
08:38:16 watch.1          |   callExtract: undefined,
08:38:16 watch.1          |   column: 0,
08:38:16 watch.1          |   extract: [ '\t}', '}', '' ],
08:38:16 watch.1          |   message: 'Unrecognised input. Possibly missing opening \'{\'',
08:38:16 watch.1          |   stack: undefined }

branch develop:

erpnext 8.11.0
frappe 8.10.0