got null or '' image url if multipleImage is true

[ilaipi]

{
      "urlImage": [
        null,
        "",
        "",
        ""
      ],
      "isVideo": true,
      "video": "https://scontent-hkg3-2.cdninstagram.com/vp/ea15e7de012f048c65133d0ba04161a4/5B849A74/t50.2886-16/37996294_326760741402685_7469339062971549339_n.mp4",
      "numberLike": null,
      "numberView": null,
      "numberComments": 5,
      "description": "Click video for sound\nVideo\n",
      "tags": null,
      "mentions": [],
      "date": "2018-08-15T07:09:39.000Z",
      "multipleImage": true
    }

and this is a post with 2 videos.