Ember-cli with cordova : Uncaught SyntaxError: Duplicate data property in object literal not allowed in strict mode

I'm using Ember-cli with cordova. I can launch my app fine in the browser with the ember server command. when I build project and try to install it on a device using cordova, I get this error:

Uncaught SyntaxError: Duplicate data property in object literal not allowed in strict mode