Platform Channel Error in Adapty Flutter SDK During Subscription Flow

[emanueltesoriello]

Hello Adapty Team,

I am encountering an issue while using the Adapty Flutter SDK during the subscription flow. After successfully completing a payment and subscribing, the expected behavior is for the subscription page to close. However, instead, the app gets stuck, and the following error appears in the logs:

"Tried to send a platform message to Flutter, but FlutterJNI was detached from native C++. Could not send. Channel: flutter.adapty.com/adapty. Response ID: 5"

Steps to Reproduce:

• Initiate a subscription flow using the Adapty Flutter SDK.
• Successfully complete the payment and subscription process.
• Observe that instead of closing the subscription page as expected, the app remains stuck, and the above error appears in the logs.

Environment Details:

• Flutter Version: 3.24.5
• Adapty SDK Version: 3.3.1
• Platform: Android version 14 - One UI 6.1
  -Device: Samsung Galaxy S23 Ultra

Could you please provide guidance on resolving this issue or confirm if it is a known bug in the Adapty Flutter SDK?

Thank you for your assistance!

Best regards,
Emanuel

[vladd-g]

Hey Emmanuel,

This looks like a known bug that should have been fixed exactly in 3.3.1 (the scenario was a bit different though, but with the same problem).

If you're sure about the SDK version, do you observe the issue every single time, including when just making a cold start followed by opening the paywall? Or are there some additional steps that lead to your case?"

[emanueltesoriello]

I have the version 3.3.1, but that issue is present every time, no matter if it's an app restart, a new install, I run it in debug mode or release mode. Actually I get that error also if I try to click the Close button, as it was reported by my colleague Daniel here. I saw it was marked as fixed, but we continue to have that problem and also this that I've just reported.

[vladd-g]

Do you observe this issue even without pressing the system back button on the root screen?

[emanueltesoriello]

No, i get this issue in 2 cases:

• pressing the back button (the Adapty default one on top-left)
• completing successfully a payment subscription

In both cases I get "Tried to send a platform message to Flutter, but FlutterJNI was detached from native C++. Could not send. Channel: flutter.adapty.com/adapty. Response ID: 5" where actually the response ID can change incrementally.

[vladd-g]

I mean the Android system back button on the bottom left (or right, depending on the settings; next to the 'home' and 'recents' buttons), not the one on the paywall.

Please let me know if the issue appears even without closing the app this way (followed by reopening)

[emanueltesoriello]

It appears also with that + with the one in the Paywall. Generally speaking once I open the paywall I can't go back/restore the app in any way, if not re-opening the app.
But the main problem we have is that after a successful payment the paywal gets stucked because of that error.

[vladd-g]

So, these steps alone (with no additional ones) don't work, correct?

1. Cold start (the root screen opens)
2. The paywall screen opens
3. You try closing the paywall in any way, and it doesn't close

[emanueltesoriello]

Correct

[vladd-g]

Thank you for the report! We'll investigate.

[vladd-g]

Does this happen on debug or release build? And could you please check this behavior on our demo app from this repository?

[emanueltesoriello]

It happens both on release and on debug. Btw yes I'll try your demo asap and I'll update you.

[emanueltesoriello]

Strangely seems working on your demo.

[vladd-g]

Please contact us at support@adapty.io

[x401om]

Hello! This issue should be fixed in 3.3.2