angularjs: Error: Firebase Database (4.3.1) INTERNAL ASSERT FAILED: Missing index implementation for isEmpty

I try to read some data from firebase, but my logic doesn’t work..
the problem seems to occur when I create a database ref.

my lib version:
AngularJS v1.6.5
AngularFire v2.3.0
Firebase v4.3.1

My firebase db:

{
  "post" : [ null, {
    "message" : "hi",
    "name" : "Mario Rossi"
  }, {
    "message" : "hi",
    "name" : "Alessia Gallina"
  }, {
    "message" : "hi",
    "name" : "Stefano Macchi"
  }, {
    "message" : "hi",
    "name" : "Roberto Singapore"
  }, {
    "message" : "hi",
    "name" : "Elena Soghi"
  }, {
    "message" : "hi",
    "name" : "Bet Bet"
  } ]
}

my controller:

(function () {
    'use strict';

    angular.module( 'messenger' )
        .controller('fireGetPost', [ 'FIREBASE','$scope','$firebaseArray',  function(FIREBASE, $scope, $firebaseArray) {
            var vm = this;
            vm.data = [];

            // Init firebase ap
            firebase.initializeApp(
                FIREBASE.config()
            );

            var ref = firebase.database().ref();
            var posts = ref.child("post");
            $scope.posts = new $firebaseArray(posts);


        }]);

})();

my html:

<md-content ng-controller="fireGetPost as controller" layout="column" class="showcase">

    <md-virtual-repeat-container id="vertical-container" flex>


        <div ng-repeat="data in controller.posts">

            <md-content class="md-padding" layout-xs="column" layout="row">

                <div flex-xs flex-gt-xs="50" layout="column">

                    <md-card class="card" md-theme="" md-theme-watch>


                        <md-card-content>
                            <p></p>
                        </md-card-content>


                    </md-card>

                </div>
            </md-content>

        </div>


    </md-virtual-repeat-container>

and the output console is:

Error: Firebase Database (4.3.1) INTERNAL ASSERT FAILED: Missing index implementation for isEmpty
    at o (libs.min.js:773)
    at i (libs.min.js:773)
    at libs.min.js:773
    at h (libs.min.js:773)
    at t.addToIndexes (libs.min.js:773)
    at t.updateImmediateChild (libs.min.js:773)
    at t.updateChild (libs.min.js:773)
    at t.updateChild (libs.min.js:773)
    at t.updateSnapshot (libs.min.js:773)
    at t.Ri (libs.min.js:773) "<main data-ng-view="" class="ng-scope" data-ng-animate="1">"

Thanks in advance!!

ps. naturally, my bundle includes:
[ ‘ngRoute’, ‘ngMaterial’, ‘ngCookies’, ‘firebase’ ]

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/09/30/angularjs-error-firebase-database-4-3-1-internal-assert-failed-missing-index-implementation-for-isempty/
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