Cannot read property `.then` of undefined with axios and react in actions - reactjs

Question

I am using axios in an action and trying to call that action with a chaining action. I will show what I am trying to do here:
this.props.fetchOffers().then(() => {
this.props.filter(this.props.filterOption);
});
But I get an error: Cannot read property 'then' of undefined.
What I do not get is that right below this function I have another action that is doing this exact same thing and working just fine.
this.props.sortOffers(value).then(() => {
this.props.filter(this.props.filterOption);
});
Here is a working version of this.
Here is the actions file:
import axios from 'axios';
import { reset } from 'redux-form';
import { FETCH_OFFERS, SORT_OFFERS, FETCH_OFFER, GET_FILTER, PAYMENT_TYPE } from './types';
export function paginateOffers(indexPosition, numberOfItems) {
return (dispatch) => {
axios
.get('/API/offers/pagination', {
params: {
position: indexPosition,
number: numberOfItems,
},
})
.then((response) => {
dispatch({ type: FETCH_OFFERS, payload: response.data });
})
.catch((error) => {
console.error(error);
});
};
}
export function fetchOffers() {
return dispatch => {
axios
.get('/API/offers')
.then((response) => {
dispatch({ type: FETCH_OFFERS, payload: response.data });
})
.catch((err) => {
console.error(err);
});
};
}
export function fetchOffer(id) {
return (dispatch) => {
axios
.get(`/API/offers/${id}`)
.then((response) => {
dispatch({ type: FETCH_OFFER, payload: response.data.result });
})
.catch((err) => {
console.error(`ERROR: ${err}`);
});
};
}
export function sortOffers(params) {
const { price, title, category, type } = params;
return dispatch =>
axios
.get('/API/offers/sort', {
params: { price, title, category, type },
})
.then((response) => {
dispatch({
type: SORT_OFFERS,
payload: response.data,
sortOptions: params,
});
dispatch({
type: PAYMENT_TYPE,
payment: type,
});
dispatch(reset('sorter'));
})
.catch((err) => {
console.error(err);
});
}
export function getFilterOption(option) {
return (dispatch) => {
dispatch({
type: GET_FILTER,
option,
});
};
}

Answer 1

You aren't returning a promise in your fetchOffers action creator. Notice the subtle difference in how you've declared your fat-arrow function.
Try this:
export function fetchOffers() {
return dispatch =>
axios
.get('/API/offers')
.then((response) => {
dispatch({ type: FETCH_OFFERS, payload: response.data });
})
.catch((err) => {
console.error(err);
});
}