Problem with redux-saga and firebase when executing a actions

I'm trying to activate an action in the execution of a saga, the problem is that the Action is never activated, this is the code:

import firebase from 'react-native-firebase';

function authorize(query) {
  console.log(query.size);
  if(query.size){
    query.forEach(doc => {
      console.log(doc.data());
      put(loginActions.setLoginSuccess(doc.data()));
    });
  } else {
    put(loginActions.setError({ error: 'El usuario no existe' })); //Nunca se ejecuta esta acción
    return undefined;
  }
}

export function* loginFlow() {
  while (true) {
    const {username, password} = yield take(actions.LOGIN_ACTION);
    const ref = firebase.firestore().collection('usuarios');
    ref
    .where('email', "==", username)
    .where('contrasena', "==", password)
    .onSnapshot(authorize);
  }
}

The execution is perfectly carried until the LoginAction.setError arrives, it does not run correctly, I have made a console.log in the reducer, but it never enters. I suppose there must be another way to implement and run the onSnapshot. Agradesco in advance.