Error: Error: TypeError: _this3.props.onError is not a function - Sandbox

[vshetti]

Hello,

While testing Paypal checkout.js REST API client side integration code (on sandbox) - https://developer.paypal.com/demo/checkout/#/pattern/client, I received following error - 

 

And this behaviour is random. Sometimes it executes and sometimes it fails. Please assist.

[snicke]

I am getting the same error in my app when trying with Sandbox.