Possible Unhandled Promise Rejection (id: 0): TypeError: this.props is undefined #23102

I have a class component as PatientQueue in PatientQueue.js file and Another class component of PatientDetailView in PatientDetailView.js file.
And I am calling function Getdetails() which is in PatientQueue class from PatientDetailView class.By creating its object. but when I am calling Getdetails I get the error of Possible Unhandled Promise Rejection (id: 0): TypeError: this.props is undefined.

and my code is like this

1. PatientQueue file
   import React from 'react';
   import { FlatList,BackHandler, ListView,ToastAndroid, ScrollView, ActivityIndicator,AppState, TouchableOpacity, Alert, StyleSheet, Image, Text, View, Button, AsyncStorage, SafeAreaView, RefreshControl } from 'react-native';
   import { createStackNavigator, createAppContainer, DrawerItems } from 'react-navigation';
   import { SearchBar, Icon } from 'react-native-elements';
   import MultiSelect from 'react-native-multiple-select';
   import { PatientDetailView } from './PatientDetailView';
   import { connect } from "react-redux";
   import { fetchQueue } from '../common/actions/patientQueue';
   import { filterQueue } from '../common/actions/filters';
   import { clearAllFilters } from '../common/actions/filters';
   class PatientQueue extends React.Component {
   constructor(props) {
   super(props);
   ......
   }

ForTesting(){
console.log("function called")
}

async Getdetails() {
console.log("fetch detailssss")

const retrievedItem = await AsyncStorage.getItem("StorageData");
const getretrievedItem = JSON.parse(retrievedItem);
var loginToken = getretrievedItem.token;

	await this.props.dispatch(fetchQueue(loginToken));
   console.log("fetch details comleted") 

}

render() {
..............
}
}
export default connect(mapStateToProps)(PatientQueue);
const RefreshList=new PatientQueue();
export{RefreshList}

2. And in PatientDetailView file

import React from 'react';
import { FlatList,Modal, ListView,TextInput, Linking,Picker, TouchableOpacity, ActivityIndicator, Alert, StyleSheet, Text, View, Button, AsyncStorage } from 'react-native';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import { Header, Left, Right, Icon, Container, Body, Title } from 'native-base';
import {RefreshList} from './PatientQueue';
import PatientQueue from './PatientQueue';

class PatientDetailView extends React.Component {
constructor(props) {
super(props);
this.state = {
modalVisible: false,
TransferModalVisible:false,
......
}
}
async OpenUhs(BtnStatus,PatientId) {
RefreshList.Getdetails();
this.props.navigation.navigate("Queue")
}

render() {

.....
}

export { PatientDetailView };