[Flutter Web] handleNextAction returns Unexpected null value

[eliamirafiori]

Describe the bug
While creating a payment intent on Flutter Web and retrieving successfully its client_secret from my backend, when I rung Stripe.instance.handleNextAction(clientSecret) to check the status of the intent, Stripe throws the following error:

Unexpected null value

To Reproduce
Steps to reproduce the behavior:

1. Use Flutter Web
2. Add to pubspec: flutter_stripe and flutter_stripe_web
3. Create a payment method and get its ID
4. Create a payment intent on your backend and get the client_secret
5. Pass the client_secret to Stripe.instance.handleNextAction

Expected behavior
I expected to get the PaymentIntent associated to the client_secret retrieved above.
But instead I get the error Unexpected null value.

The client_secret passed is not null, it's a String.

PC / Chrome

• Device: PC
• OS: Win 11
• Package version: flutter_stripe: ^10.1.1
• Package version: flutter_stripe_web: ^5.1.0
• Flutter version: 3.16.9

[guidotheelen]

Also facing this issue:
#1746