TypeError: Cannot call method 'indexOf' of undefined

Ionic Framework ionic-v3
1

Hi All,

Has anyone seen this error before? I get it in app.ts when I run the app on an emulator. I don’t get it in a browser. I h appends when the app first starts.

Angular 2 is running in the development mode. Call enableProdMode() to enable the production mode. app.bundle.js:2701
DEVICE READY FIRED AFTER 1512 ms app.bundle.js:91415
EXCEPTION: Error: Uncaught (in promise): TypeError: Cannot call method 'indexOf' of undefined app.bundle.js:44906
EXCEPTION: Error: Uncaught (in promise): TypeError: Cannot call method 'indexOf' of undefined app.bundle.js:44897
STACKTRACE: app.bundle.js:44897
Error: Uncaught (in promise): TypeError: Cannot call method 'indexOf' of undefined
    at resolvePromise (file:///android_asset/www/build/js/zone.js:538:32)
    at file:///android_asset/www/build/js/zone.js:574:18
    at ZoneDelegate.invokeTask (file:///android_asset/www/build/js/zone.js:356:38)
    at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (file:///android_asset/www/build/js/app.bundle.js:13297:42)
    at ZoneDelegate.invokeTask (file:///android_asset/www/build/js/zone.js:355:43)
    at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (file:///android_asset/www/build/js/app.bundle.js:13297:42)
    at ZoneDelegate.invokeTask (file:///android_asset/www/build/js/zone.js:355:43)
    at Zone.runTask (file:///android_asset/www/build/js/zone.js:256:48)
    at drainMicroTaskQueue (file:///android_asset/www/build/js/zone.js:474:36)
    at XMLHttpRequest.ZoneTask.invoke (file:///android_asset/www/build/js/zone.js:426:22) app.bundle.js:44897
Unhandled Promise rejection: Cannot call method 'indexOf' of undefined ; Zone: angular ; Task: Promise.then ; Value: 
TypeError
 zone.js:461
Error
message: "Uncaught (in promise): TypeError: Cannot call method 'indexOf' of undefined"
promise: ZoneAwarePromise
rejection: TypeError
stack: "Error: Uncaught (in promise): TypeError: Cannot call method 'indexOf' of undefined↵    at resolvePromise (file:///android_asset/www/build/js/zone.js:538:32)↵    at file:///android_asset/www/build/js/zone.js:574:18↵    at ZoneDelegate.invokeTask (file:///android_asset/www/build/js/zone.js:356:38)↵    at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (file:///android_asset/www/build/js/app.bundle.js:13297:42)↵    at ZoneDelegate.invokeTask (file:///android_asset/www/build/js/zone.js:355:43)↵    at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (file:///android_asset/www/build/js/app.bundle.js:13297:42)↵    at ZoneDelegate.invokeTask (file:///android_asset/www/build/js/zone.js:355:43)↵    at Zone.runTask (file:///android_asset/www/build/js/zone.js:256:48)↵    at drainMicroTaskQueue (file:///android_asset/www/build/js/zone.js:474:36)↵    at XMLHttpRequest.ZoneTask.invoke (file:///android_asset/www/build/js/zone.js:426:22)"
task: ZoneTask
zone: Zone
__proto__: d