Formik React throws an error, when working with array inside of the nested object

Th problem appears, when I try to create a FieldArray Formik to worm with an array inside an nested object. The code I use to get values is like ‘arrayHelpers.form.values[arrayHelpers.name].conditions’
It works quite well, when it comes to displaying the values and correcting them, but when it comes to creating row (PUSH) i get an error ‘can’t access property “push”, arrayHelpers[arrayHelpers.name] is undefined’
the whole component is in the sandbox https://codesandbox.io/s/heuristic-williams-6jocp1?file=/src/Formik.tsx:1039-1040

FieldArray looks like this:

export const FieldArrayConditions = (arrayHelpers: any) => {
    const conditions = arrayHelpers.form.values[arrayHelpers.name].conditions
    return(
    <>
    {conditions.map((_: void, index: number) => {
        return (
            <div key={index} className='form__row-condition'>
                <input type='hidden' name={`${arrayHelpers.name}.conditions[${index}].id`}/>
                <input type='hidden' name={`${arrayHelpers.name}.conditions[${index}].margin_id`}/>
                <Field 
                    type='number'
                    name={`${arrayHelpers.name}.conditions[${index}].price_from`}
                    component={InputNotLabeled}
                    />
                <Field
                    name={`${arrayHelpers.name}.conditions[${index}].price_measure.id`}
                    component={SelectorCurrencies}
                    />
                <span>до</span>
                <Field 
                    type='number'
                    name={`${arrayHelpers.name}.conditions[${index}].price_before`}
                    component={InputNotLabeled}
                    />
                <Field
                    name={`${arrayHelpers.name}.conditions[${index}].price_measure.id`}
                    component={SelectorCurrencies}
                    />
                <span>=</span>
                <Field 
                    type='number'
                    placeholder='Сумма'
                    name={`${arrayHelpers.name}.conditions[${index}].margin`}
                    component={InputNotLabeled}
                    />
                <Field
                    name={`${arrayHelpers.name}.conditions[${index}].price_measure_id`}
                    component={SelectorCurrencies}
                    value={`${arrayHelpers.name}.conditions[${index}].price_measure.id`}
                    />
            </div>
        )
    })}
    <div className="form__fieldset">
        <BtnExport text={'Добавить условие'} 
        changeAction={() => arrayHelpers.push(initialConditions)}/>
    </div>
    </>
)}