SassError: $color: shade-color(#f0f5fa, 50%) is not a color on Morph theme

[ricvillagrana]

All other themes work fine except for this one.

Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: $color: shade-color(#f0f5fa, 50%) is not a color.
    ╷
339 │     box-shadow: 1px 1px 3px rgba($black, .2), inset 2px 2px 8px rgba(shade-color($form-range-thumb-bg, 50%), .1);
    │                                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ╵
  node_modules/bootswatch/dist/morph/_bootswatch.scss 339:65  @import
  assets/css/main.scss 19:9                                   root stylesheet