Biometric Verification on any site breaks Barcode Scanner

[PauleBlack]

Can we access your project?

• I give permission for members of the FlutterFlow team to access and test my project for the sole purpose of investigating this issue.

Current Behavior

If the Action "Biometric Verification" exists on any site, the Action "Scan Barcode/QR Code" does nothing globally. It does not matter, if you actually used Biometric Verification (or it succeded or failed), Barcode Scan just does nothing.

It throws an Error on the Device Logs:

E/flutter (29287): [ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: MissingPluginException(No implementation found for method scanBarcode on channel flutter_barcode_scanner)

Expected Behavior

For "Scan Barcode/QR Code" to work as inteded.

Steps to Reproduce

1. Create new Page
2. Create Button - add Action "Scan Barcode/QR Code"
3. Create Button - add Action "Biometric Verification"
4. Local Run on device and try "Scan Barcode"-Button

Reproducible from Blank

• The steps to reproduce above start from a blank project.

Bug Report Code (Required)

ITFTh+fqwIt1mNte+Kr2YflvvCY4CUMfWLsr0utuGA0hNYzyEZoDP8/CSBBLYtfkS1VMIVWJp3EKpsrqjYXmGvAFPSetbb5P+pRXQQrheGSmVJCbDKiwOnNQP95TGlCP3Ji7rBVSCMF1cmxm7V6YO/CdG3qCf9qOYwx5e6fDbOY=

Visual documentation

Environment

- FlutterFlow version: v6.3.1+ (released September 9, 2025 - updated today, did not work with previous version either)
- Platform: Android Local Run
- Operating system and version affected: Android 16

- no Browser: Barcode Scan and Biometric Verifactaion are App-only actions.

Additional Information

It did work around a year ago, but I needed to make an update and realized this is a new bug that breaks a lot of my app. Last Version of my app was from Jan 4, 2024 - so this Unhandled Exception Error was introduced somewhere in the last 18 Months.

Both Actions are Crucial for my App.

[Alezanello]

Hello! 👋

Could you please try deleting the project’s cache folder locally? This will force the local run test to refresh pub get and download the correct plugin for the app.

Are you working on Windows or Mac? Once I know, I can share the exact folder path with you.

[PauleBlack]

Hello!
Windows 10
I found the local cache Folder in \AppData\Roaming\FlutterFlow\flutterflow

I deleted everthing in that Folder. Still the same problem.

I downloaded the APK for my test Project "QRBug" (it has only two buttons, Barcode Scan and Biometric Verification). That also does not work - so the problem is not just with local run.

I only have one android phone to test however.

[Juansarmi]

Hello!

I'm sorry you're experiencing this issue. I was able to reproduce the error and will be forwarding it to our engineering team for further investigation. I’ll let you know as soon as I have any updates.