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Error 12 Received malformed response from the backend.


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What does “Error 12 Received malformed response from the backend.” mean when running this Flutter code?

CustomerInfo? customerInfo = await Purchases.getCustomerInfo();

How can I debug/fix this?

Note that I am only seeing this in iOS.

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2 replies

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  • RevenueCat Staff
  • 579 replies
  • April 30, 2025

Hi, this usually means there was an issue with the specific data returned by the backend response to an SDK request. Would you be able to provide more full logs around this or confirm the app user IDs of the users who saw this? Additionally, do you know the context for this error or what the users were doing when this error was returned? If it happened close together it may have been during a brief server issue, but more full logs or the IDs so we can check server logs on our end should help us narrow down specifically what happened, see our docs here: https://www.revenuecat.com/docs/test-and-launch/debugging#section-debugging


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  • Author
  • Dedicated Member
  • 15 replies
  • May 1, 2025

No, unfortunately I do not have any additional info about when this error occurred. The good news is that it hasn’t happened again recently. Thank you.


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