为什么我在Firebase中遇到此异常？

Question

嘿，我是React Native的新手，我有一个应用程序，可以从Firebase那里获取数据，直到到达我应该获取数据的屏幕，然后按名称或距离名称对它进行排序都很好，但与距离相比，它给了我一个异常甚至是地理定位有时都行得通，有时没有，我删除浏览器缓存，删除应用程序，删除手机缓存，但仍然是同一个问题

@firebase/database: FIREBASE WARNING: Exception was thrown by user callback. Error: 'undefined' is no valid coordinate.

firebase.database().ref().child('businesses')
     .orderByChild('category')
     .equalTo(`${this.state.idorga}`)
     .once('value', (snapshot) => {
      const data = snapshot.val();
     // const items = Object.values(data);
      const items = Object.keys(data).reduce((result, key) => 
      result.concat({ id: key, ...data[key] }), []);
      const data1 = items;
//here the code who sort my data with name
     if (this.state.tri !== 'alphabetique') {
      let i = 0;
      while (i < data1.length - 1) {
        if (data1[i].name.localeCompare(data1[i + 1].name) === 1) {
                const a = data1[i];
                data1[i] = data1[i + 1];
                data1[i + 1] = a;
                i = 0;
        } else {
          i++;
        }
      } 
} else {
//here where i try to sort my data using distance 
  let i = 0; 
  navigator.geolocation.getCurrentPosition((position) => this.setState({ location: position }));
  while (i < data1.length - 1) {
// here i am using geolib to calcule disttance and store it on a const
    const A = geolib.getDistance(this.state.location.coords, {
      latitude: data1[i].mapdata.annotations[0].latitude,
      longitude: data1[i].mapdata.annotations[0].longitude,
  });
  const B = geolib.getDistance(this.state.location.coords, {
    latitude: data1[i + 1].mapdata.annotations[0].latitude,
    longitude: data1[i + 1].mapdata.annotations[0].longitude,
});
if (A > B) {
  const a = data1[i];
  data1[i] = data1[i + 1];
  data1[i + 1] = a;
  i = 0;
} else {
i++;
}
  }
}
     this.setState({ items: data1 });
     this.setState({ dataBackup: data1 });
   });
  }