Boolean Return Value Allows Empty Result and Stops Flow Execution

[Szymek2025]

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• 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

When this action block is called:

• If it returns true, everything works correctly and the flow continues.
• If it returns nothing (empty), the flow where this action block is used stops executing.

This likely happens because the caller expects a true or false value, but instead receives null / no value.

Expected Behavior

If the return type is Boolean, the return value should always be required and must return either true or false.

A possible solution would be:

• Automatically mark Boolean return values as required
• Prevent users from unchecking the “required” option when the return type is Boolean

This would avoid situations where a Boolean action block returns no value and unintentionally breaks the execution flow.

Steps to Reproduce

1. Create new Action Block
2. Add return in it and set type to boolean
3. Add some actions ad conditional when if true return true if false dont return anything
4. Get and set this Action Block in Flow
5. After this action block get snack bar with some text
6. Run action with return true and false

Reproducible from Blank

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

Bug Report Code (Required)

IT4sj+flvYtOmM9G15PqccFB/Sk4KWE1UL8sscp/bxIgGIDzPOw+ZPXsRFRtTbChS1ZmIUSmmkIGzMrpi+D9Du05ISmsGKJi1rVyZA3/Ul6na5OBOpeef39ARP5mfFSG3MPYkR55PvNoLFYc3WaQAueUQijrNr74ImdISq/LZO4=

Visual documentation

Environment

- FlutterFlow version: 6.4.71
- Platform: Desktop
- Browser name and version: Chrome latest
- Operating system and version affected: Windows

Additional Information

No response

[Alezanello]

Hello!

I’m not sure that the issue you’re describing is a bug in FlutterFlow—it seems more like a conditional logic issue that you can address. We have a constant Null value that you can use for additional verification. For example, you can check if a value is false or null and then take action accordingly, rather than just checking for true or false, in cases where you're dealing with null values.