[SOLVED] Uncaught (in promise): false (nightly-build / RC.4)

When I open my massive wizard (one page component, many slides, too many components, many directives etc.) I’ve got the following error the very first time I load everything:

Error: Uncaught (in promise): false
at s (polyfills.js:3)
at s (polyfills.js:3)
at polyfills.js:3
at t.invokeTask (polyfills.js:3)
at Object.onInvokeTask (ng_zone.js:227)
at t.invokeTask (polyfills.js:3)
at e.runTask (polyfills.js:3)
at i (polyfills.js:3)
at HTMLElement.invoke (polyfills.js:3)

Which brings me absolutely no valuable informations to find out what’s happening.

Any idea how could I get more stacktraces to at least have a start point to find out what is the problem?

I opened an issue, turns out it’s a mix between loading and navcontroller in the nightly-build which produce the error

jsayol find a quick win fix and created a PR

if anyone of the ionic team read this, plz push the PR, it’s a super fast quick win for the quality of RC.4

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am getting the same error but for just setting the rootPage !!

the code in the app.component.ts

af.auth.subscribe( user => {
if (user) {
this.rootPage = ContactPage;
} else {
this.rootPage = LoginPage;

its just angularFire auth check, and as soon as the ContactPage is Showen, i receive the following Error

Runtime Error
Uncaught (in promise): false
Error: Uncaught (in promise): false
at s (http://localhost:8100/build/polyfills.js:3:4211)
at s (http://localhost:8100/build/polyfills.js:3:4034)
at http://localhost:8100/build/polyfills.js:3:4574
at t.invokeTask (http://localhost:8100/build/polyfills.js:3:9723)
at Object.onInvokeTask (http://localhost:8100/build/main.js:35478:37)
at t.invokeTask (http://localhost:8100/build/polyfills.js:3:9659)
at e.runTask (http://localhost:8100/build/polyfills.js:3:7083)
at i (http://localhost:8100/build/polyfills.js:3:3671)
at HTMLElement.invoke (http://localhost:8100/build/polyfills.js:3:10876)
Ionic Framework: ^2.0.0-rc.4
Ionic Native: 2.2.11
Ionic App Scripts: 0.0.48
Angular Core: 2.2.1
Angular Compiler CLI: 2.2.1
Node: 6.9.2
OS Platform: Windows 8.1
Navigator Platform: Win32
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36


Seems that they merged a solution for that task in the nightly, but I was unable to test it because this I face another problem elsewhere :frowning:

In my case, apparently it was because of the “dismissOnPageChange: true” I was using in loadingController.create().

Following code was giving me the error:

    let loader = this.loadingController.create({
        content: 'loading...',
        dismissOnPageChange: true

        .subscribe(t => this.navCtrl.push(TeamPage, game.team));

I read somebody’s comment on the link provided by reedrichards above and changed my code to remove “dismissOnPageChange” like below and it worked absolutely fine.

    let loader = this.loadingController.create({
        content: 'loading...'

    loader.present().then(() => {
            .subscribe(t => {
                this.navCtrl.push(TeamPage, game.team);

Wasted lot of time to fix this. :frowning:


Thank you! I spun my wheels on this before finding your note.

I was experiencing this issue and kept the dismissOnPageChange in place and removed my intentional dismiss directives. I was lucky, I suppose, because all my actions forced the current page to pop.

Last nightly, 2.0.0-rc.4-201701062325, solve this issue. Gonna then be fixed in RC.5

This problem came back on me (in rc.4 and 2.0.0) and I found this simple, clean solution by jigsaxis in https://forum.ionicframework.com/t/runtime-error-after-upgrade-to-rc4/73773/9




loading.dismiss().catch(() => {});


i have same problem because i called dismiss louder many time
solution is to dismiss louder only one time

Check your code where you have used
I think somewhere it uses more than ones in same block Or it dismiss unexpectedly.

1 Like

This solved the problem for me. Thanks!

1 Like

any solution for this error: runtime error uncaught in promise object

I got this error but I dont know where is the problem any ideas to solve this please


My issue was happening because I was trying to dismiss loading twice.

I’m actually coding with Ionic 2 / Angular 2 and had the same error with the Promise,
Here is the code that worked for me:

import { Injectable } from '@angular/core';
import { LoadingController } from 'ionic-angular';

export class LoadingService {
  private loader;

  constructor(public loading: LoadingController) {

  init() {
    this.loader = this.loading.create({content:'Loading...', duration: 30000});

  activate() {
    if (this.isLoaderUndefined())

  deactivate() {
    if (!this.isLoaderUndefined())
      this.loader.dismiss().catch(() => console.log('ERROR CATCH: LoadingController dismiss'));
    this.loader = undefined;

  isLoaderUndefined(): boolean {
    return (this.loader == null || this.loader == undefined);

Hope that it helps :slight_smile:


My fix for the same problem (the loader would not dimiss with the code solutions above)

                .catch((reason: any) => {
                    this.loggerService.error('SpinnerService - loading.dismiss()', reason);
                    **this.loading.dismissAll();  //had to add this or it would not dismiss**

Thanks, This worked…

This worked for me. Not sure what the cause of the problem was in the first place, as this issue only happened one place in our code.

This can also happen if you have a bad chain of events or loop. For example, if use a loadingController with no dismiss, because the if() statement calls a value that doesn’t exist yet (remember to use then() and promises for that).