realmの返り値を判定要素として使う場合の扱い方

const Schema = {
  name: "Cource",
  properties: {
    name: "string",
    data: "int?",
  },

try{
  const realm = await Realm.open({
    path: "myCource",
    schema: [Schema],
  });
  task = realm.objects("Cource");
  if(task.length > 0){
    navigation.reset({
      index: 0,
      routes: [{ name: 'main' }],
    });
  }
}catch(error){
  console.log('エラー' + error.message);
}