Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'subscriptionFailedCallback')

[divsbhalala]

I implement the subscription in my app and subscription working fine but in sentry and console I am seeing this error

[cefeboru]

@divsbhalala were you able to find what was causing this issue? We are having a lot of reports in sentry as well

[AndrzejSala]

We have the same issue. It can be triggered by network error and then there are errors like this on reconnect / refetch.

[AndrzejSala]

@divsbhalala Could you share your package.json?

[jacobgranberry]

Same happening here, been happening for months.

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'subscriptionFailedCallback')
    at AppSyncRealTimeSubscriptionHandshakeLink.<anonymous> (realtime-subscription-handshake-link.js:325:1)
    at step (realtime-subscription-handshake-link.js:57:1)
    at Object.next (realtime-subscription-handshake-link.js:38:1)
    at fulfilled (realtime-subscription-handshake-link.js:29:1)
    ```

[arbaaz]

Same here.

[arbaaz]

Any updates on this?

[ryancrunchi]

Duplicate of https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/509

[heanfig]

Any updates ?

    "@apollo/client": "^3.5.10",
    "aws-appsync-subscription-link": "^3.1.2",

[shawngustaw]

Anyone have any ideas? I'm hitting this using Next with strict mode turned off. I managed to temporarily work around this by delaying setting up the subscription using a setTimeout(() => {enableSubscriptions(true)}, 0) on mount, but don't know how stable this is.

[shawngustaw]

@heanfig could you test/verify this PR to fix this? https://github.com/awslabs/aws-mobile-appsync-sdk-js/pull/747. To build I had to add types: [] to the tsconfig.json but then you can run yarn prepare && yarn pack and then yarn add ../path/to/package.tar.gz the file that gets created from yarn pack.

[omerson]

in my case skip: !idToSubscribeOn solved the problem

[objectiveSee]

@omerson can you elaborate on how this fixed your problem? Do you have a code example? I am facing the same issue today.

[shawngustaw]

@omerson can you elaborate on how this fixed your problem? Do you have a code example? I am facing the same issue today.

I believe this happens specifically during navigation in nextJS so just delaying setting up the subscription until after the page renders seems to work. I have a PR that fixes this that we've been running in prod as a patch (using patch-package) for a couple days without issue and I haven't seen this pop up again. Trying to get someone from AWS to review but it seems like this package is abandoned.

[shamseer-ahammed]

+1

@shawngustaw did u fix it ?

[shawngustaw]

@shamseer-ahammed yes using a patch with this PR:

https://github.com/awslabs/aws-mobile-appsync-sdk-js/pull/747

[gong917727564]

Any updates on this?

[ivadenis]

facing the same issue in nextjs app

[shamseer-ahammed]

@gong917727564 @ivadenis tried with [email protected] ?