At the end of file MDB/scss/pro/picker/_default.scss there is a rule

.picker__input.picker__input--active {
 border-color: magp-get($blue, "lighten-5");
}

It should be map-get, right now compiler produces invalid CSS which my minifier (csso) is refusing to minify.

Instead of

border-color: #e3f2fd;

We get

border-color: magp-get(("lighten-5": #e3f2fd, "lighten-4": #bbdefb, "lighten-3": #90caf9, "lighten-2": #64b5f6, "lighten-1": #42a5f5, "base": #2196f3, "darken-1": #1e88e5, "darken-2": #1976d2, "darken-3": #1565c0, "darken-4": #0d47a1, "accent-1": #82b1ff, "accent-2": #448aff, "accent-3": #2979ff, "accent-4": #2962ff), "lighten-5");