Error Property 'data' does not exist on type 'string'

cordova
1

Error happend sometimes on server and always when i try to run on ANDROID.

this.feeds.forEach((e, i, a) => {
if (!e.data.thumbnail || e.data.thumbnail.indexOf(‘b.thumbs.redditmedia.com’) === -1 ) {
e.data.thumbnail = ‘http://www.redditstatic.com/icon.png’;
}
})

Ionic Framework 3.7.1
Ionic App Scripts 3.0.0

Angular Core 4.4.3
Angular Compiler CLI 4.4.3

Node 6.11.4
Windows 7
Win 32