PrimeNG does not work with SASS theme change

[JeffBrower]

When using the SCSS/SASS option for styling, the theme change fails.

The error returned is:

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 ERROR TypeError: Cannot read property 'href' of null

The relevant lines of code are:

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   const themeLink: HTMLLinkElement = <HTMLLinkElement>document.getElementById('theme-css');
   const href = themeLink.href;

in my angular-cli.json I enabled SCSS as my default like this:

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  "defaults": {
    "styleExt": "scss",
    "component": {}
  }

I am enabling the SCSS with this in styles.scss:

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@import 'assets/theme/theme-blue-light.scss',
        'assets/layout/css/layout-blue-light.scss'

Everything works as long as you are willing to dedicate to a single theme and remove user choices.

Is this intended functionality, or is PrimeNG truly limited to only CSS if you want to use the theme switching function?