Demo doesn't work - white page

[Semigradsky]

https://mapa.falanster.by/

There is error in browser console:

Uncaught Error: Expected the reducer to be a function.
    at B (app.js:6)
    at computeNextEntry (<anonymous>:3395:21)
    at recomputeStates (<anonymous>:3429:17)
    at <anonymous>:3809:22
    at dispatch (<anonymous>:12794:22)
    at createStore_createStore (<anonymous>:12869:3)
    at <anonymous>:3959:21
    at <anonymous>:3918:25
    at <anonymous>:14479:12
    at createStore_createStore (<anonymous>:12680:45)