I was getting an error with an error being generated by ThemedAutocomplete (null error at line 216 Object.keys(mixin).forEach(function (key) { ) in components/themr.js).

I believe this export in Autocomplete is the issue line 434:-
export default themr(AUTOCOMPLETE, null, { withRef: true })(Autocomplete);

Replacing it with an object worked for me:-
export default themr(AUTOCOMPLETE, {}, { withRef: true })(Autocomplete);