Unhandled JS Exception: TypeError: undefined is not an object (evaluating 'this._subscribableSubscriptions.forEach')

[xardit]

When changing scheme to Release in able to run the app on the device, it triggered an error

Unhandled JS Exception: TypeError: undefined is not an object (evaluating 'this._subscribableSubscriptions.forEach')

This crashed the application.

I searched for the error code and found it: project/node_modules/react-native/Libraries/Components/Subscribable.js on line 33 with RN 0.51.0

[react-native-bot]

@facebook-github-bot no-template

[xardit]

I fixed it by evaluating variable this._subscribableSubscriptions on line 33 on react native file project/node_modules/react-native/Libraries/Components/Subscribable.js

Changing this:

this._subscribableSubscriptions.forEach(

To this:

this._subscribableSubscriptions && this._subscribableSubscriptions.forEach(

[facebook-github-bot]

Hey @a3diti, thanks for posting this! It looks like your issue is missing some required information. Can you please add all the details specified in the Issue Template? This is necessary for people to be able to understand and reproduce your issue. I am going to close this, but please feel free to open a new issue with the additional information provided. Thanks!

_{How to Contribute • What to Expect from Maintainers}

[avshenuk]

@facebook-github-bot reopen please. It's the same issue for me. No addition information. Just started to throw this error today without any changes.

Related to ScrollView. It appears on any View containing ScrollView inside like FlatList.

[avshenuk]

React Native version 0.50.3 is affected too

[xardit]

My bad for closing it, the issue is fixed for the moment as i mentioned it above, the problem seems to be related to the Subscribable component of RN.

[noambonnie]

I also have this issue. RN 0.51.0, running a release build on Android 7.

[leethree]

I'm seeing the exact same issue. Looks like Subscribable.componentWillUnmount is called before Subscribable.componentWillMount is called.

[zhangsn]

Same issue for me. No code changes. It suddenly fails. RN 0.50.4

[gveeden]

@a3diti I Could kiss you!

[brownieboy]

Getting this error too, on a new test app, created with react-native-cli@2.0.1, which used react-native 0.51.0 and react 16.0.0. Also using react-navigation and native-base.

@a3diti 's code change to the Subscribable.js file worked for me, but that's a workaround, not a fix. You would have to put that code change in every time you cloned your repository and then ran npm install. We need a proper fix for this.