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.