TypeError: n.addValue is not a function in production build

[bluescreen]

When compiling in prod setting i get the following error. In dev mode its working.

TypeError: n.addValue is not a function
    at e.tagHolidayDefinition (country.js:60)
    at abstract-holiday-definition-factory.js:157
    at Array.map (<anonymous>)
    at t.e.getDefinitionsForAdministrativeUnits (abstract-holiday-definition-factory.js:157)
    at t.e.loadDefinitions (abstract-holiday-definition-factory.js:217)
    at t.loadDefinitionsCached (index.js:55)
    at t.e.getDefinitions (abstract-holiday-definition-factory.js:227)
    at t.getHolidayDefinitions (sync-moment-holiday.js:34)
    at t.for (sync-moment-holiday.js:51)
    at t.isHoliday (sync-moment-holiday.js:39)

Here is my code

import moment from "moment";
import createMomentHolidayConfiguration from "@nesto-software/moment-holiday";
const holidays = createMomentHolidayConfiguration("DE", "NW");

function calcWorkDays(start, end){
    let workDays = 0;
    do{
        start.add(1, 'day');
        if([0,6].indexOf(start.day()) == -1 && !start.isHoliday(holidays)){
            workDays++;
        }
    }while(start.isBefore(end))
    return workDays;
}

const start = moment("2011-03-01", "yyyy-mm-dd");
const now   = moment();
const workDays = calcWorkDays(start,now);
console.log(workDays);