why a simple excel custom function keeps busy?

[oldoldman]

Hi guys,
I have an excel custom function which simply returns an array like this

function version() {
  return [
    ['version', 'TCGA 1.0'],
    ['author', '[email protected]'],
    ['homepage', 'https://oiltei.com'],
  ]
}
CustomFunctions.associate('VERSION',version)

when calling it in excel, the cell keeps busy and never return the value.

How does this happen? Many thanks!!!

[oldoldman]

found why. I have another function which uses the ECMA script syntax of optional chain (a.b?.c). This syntax is not supported by the custom function runtime yet.