Requiring module 'NativeModules' by name - arguments[0].indexOf is undefined

[ben-snaize]

Hi,

Seeing an odd issue in RN 0.42 (since upgrading from 0.38, I believe).

I can't replicate the crash locally in debug or release which makes things difficult, but on both iOS and Android I'm seeing the following logged from Crashlytics. Both apps run through flawlessly locally, on device and via TestFlight / Play Store beta, yet something like like 1 in 20 users of the live Apps are crashing due to this:

RCTFatalException: Unhandled JS Exception: arguments[0].indexOf is not a function. (In 'arguments[0].indexOf("Requiring module 'NativeModules' by name")', 'arguments[0].indexOf' is undefined)

This seems to be stemming from here in index.[os].bundle.js where arguments[0].indexOf is called.

console.warn = function () {
    if (arguments[0] && arguments[0].indexOf('Requiring module \'NativeModules\' by name') > -1) return;
    return originalWarn.apply(console, arguments);
};

Does anyone have an idea of what could the cause of this? Why would arguments[0].indexOf be undefined at this stage?

I know the crash is very context dependent but some sort of pointer would be of great help.

[hramos]

This issue looks like a question that would be best asked on StackOverflow.

StackOverflow is amazing for Q&A: it has a reputation system, voting, the ability to mark a question as answered. Because of the reputation system it is likely the community will see and answer your question there. This also helps us use the GitHub bug tracker for bugs only.

Will close this as this is really a question that should be asked on StackOverflow.

[ben-snaize]

Thanks, I'm active on SO. I'll post there.

[IrinaCodixis]

Hi @ben-snaize .
I am experiencing the same issue. Did you manage to find the solution?

[ben-snaize]

@IrinaCodixis For our production code, removing all calls to console.warn/console.log was the solution. These shouldn't be in the prod code anyway :)

[koenpunt]

FYI, it's probably because of this module: https://github.com/jhen0409/rn-host-detect/blob/master/index.js#L44

[ben-snaize]

Turns out console.warn and Code Push bundling are the cause here. Solution is to remove the warns