[in_app_purchase_store_kit] 'Null check operator used on a null value' is thrown on calling SKPaymentQueueWrapper.transactions().

[agent515]

Steps to reproduce

Not entirely sure how to reproduce the error. As it seemed to work for a brief period of time and then started throwing error. Maybe after some failed or pending transactions. (Sandbox Environment)

• Make a few purchases buyNonConsumable.
• After some pending or failed transactions, call SKPaymentQueueWrapper().transactions()

Expected results

All previous failed or pending transactions are completed or cleared without any error.

Actual results

Error: Null check operator used on a null value

Code sample

Code sample

 Future finishQueueTransactions() async {
    final transactions = await SKPaymentQueueWrapper().transactions();
    for (final element in transactions) {
      await SKPaymentQueueWrapper().finishTransaction(element);
    }
  }

Screenshots or Video

Screenshots / Video demonstration

[Upload media here]

Logs

Logs

flutter: Null check operator used on a null value
flutter: #0      SKErrorMessage.decode (package:in_app_purchase_storekit/src/messages.g.dart:190:24)
#1      SKPaymentTransactionMessage.decode (package:in_app_purchase_storekit/src/messages.g.dart:111:28)
#2      SKPaymentTransactionMessage.decode (package:in_app_purchase_storekit/src/messages.g.dart:106:41)
#3      _InAppPurchaseAPICodec.readValueOfType (package:in_app_purchase_storekit/src/messages.g.dart:297:44)
#4      StandardMessageCodec.readValue (package:flutter/src/services/message_codecs.dart:477:12)
#5      StandardMessageCodec.readValueOfType (package:flutter/src/services/message_codecs.dart:522:23)
#6      _InAppPurchaseAPICodec.readValueOfType (package:in_app_purchase_storekit/src/messages.g.dart:301:22)
#7      StandardMessageCodec.readValue (package:flutter/src/services/message_codecs.dart:477:12)
#8      StandardMessageCodec.readValueOfType (package:flutter/src/services/message_codecs.dart:522:23)
#9      _InAppPurchaseAPICodec.readValueOfType (package:in_app_purchase_storekit/src/messages.g.dart:301:22)
#10     StandardMessageCodec.readValue (package:flutter/src/services/message_codecs.dart:477:12)
#11     StandardMessageCodec.decodeMessage (package:flutter/src/services/message_codecs.dart:341:28)
#12     BasicMessageChannel.send (package:flutter/src/services/platform_channel.dart:206:18)
<asynchronous suspension>
#13     InAppPurchaseAPI.transactions (package:in_app_purchase_storekit/src/messages.g.dart:357:9)
<asynchronous suspension>
#14     SKPaymentQueueWrapper.transactions (package:in_app_purchase_storekit/src/store_kit_wrappers/sk_payment_queue_wrapper.dart:63:9)

Flutter Doctor output

Doctor output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.16.8, on macOS 14.2 23C64 darwin-arm64, locale en-IN)
[!] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
    ! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 15.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.1)
[✓] VS Code (version 1.86.1)
[✓] Connected device (3 available)
[✓] Network resources

! Doctor found issues in 1 category.

Device: iPhone 14 (iOS 17.2.1)

[darshankawar]

Thanks for the bug report @agent515
The log seems to be pointing to in_app_purchase_storekit package which is newly published https://pub.dev/packages/in_app_purchase_storekit
Are you directly / explicitly using this package in your app ?

Also, the code sample you provided, does it throw the same exception if you try to run it locally in debug mode on same iOS version ?

[agent515]

Hi @darshankawar .

The log seems to be pointing to in_app_purchase_storekit package which is newly published https://pub.dev/packages/in_app_purchase_storekit
Are you directly / explicitly using this package in your app ?

I tried both approaches. Indirectly using through just in_app_purchase: ^3.1.5 and also explicitly adding in_app_purchase_storekit: ^0.3.9 in pubspec.yaml. I had noticed this recently merged PR related to this but I'm not sure if it actually fixes the issue. I tried the latest store_kit code by downloading files and using path in pubspec.yaml but the issue persists.

Also, the code sample you provided, does it throw the same exception if you try to run it locally in debug mode on same iOS version?

Yes, facing this locally in debug version. The In App Purchase isn't in the production yet.

[darshankawar]

Thanks for the update. I tried using the code snippet provided using the plugin example, but I wasn't able to replicate it.
Maybe I wasn't able to setup properly, but based on the report and exception triggered, keeping the issue open for team's input / attention.

[jmagman]

cc @LouiseHsu

[LouiseHsu]

Tried to repro this bug, but I don't seem to be able to. Going off the stacktrace, I added some extra checks in flutter/packages#6032, so please try upgrading and see if that mitigates the issue! Will leave this issue open for now just in case.

[agent515]

@LouiseHsu It's resolved. Thanks!

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.