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In case that secure random number generation is not available the code tries to capture UI behavior for entropy collection.
Are you lazy loading the library just before the stage where you do encryption? In which case the library does not get the UI input it needs for entropy collection?

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Hey @ArnoudAdyen! Thanks for your response.

It doesn't seem I'm calling it lazily. So, my setup is following. I include Adyen CSE-JS in NPM "adyen-cse-js": "git://github.com/Adyen/CSE-JS.git#v0.1.18" and import it in one of my Webpack modules

import adyenEncrypt from 'adyen-cse-js';
const getAdyenData = (adyenFields, adyenPayment) => {
  return adyenEncrypt.createEncryption(adyenPayment.clientSide.key, {}).encrypt(adyenFields);
}
export default {
  getAdyenData,
};

getAdyenData and adyenEncrypt.createEncryption are not called immediately, only when chosen and used as payment method, but anyway I get this error when whole bundle is loaded.

I'm loading the whole using async="async" - could that be the issue?

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The collection is started by this call sjcl.random.startCollectors(); in adyen.encrypt.js#425. So what you could try is call to adyenEncrypt.createEncryption early on. I think the sjcl library might not be exposed to the window object for you to call it directly.

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Hmm... I've only now tested the whole payment flow and it seems that it's working. My test payment got through. So, can be the case that this error is more of a notice, but CSE-JS still manages go gather entropy through UI? @ArnoudAdyen
https://github.com/bitwiseshiftleft/sjcl/blob/master/core/random.js#L519

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