Custom Function can not be saved with the specific function name.

[satoshikumano]

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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

Step to reproduce:

• Create enum "TransportBureau"
• Create custom function:
  • name: "convertStringToTransportBureau"
  • Return type: TransportBureau (Nullable)
  • Argument: transportBureauString (String/ Nullable)
• Edit function body returns null
• Click Save

Current Behavior:

"The function is empty or cannot be parsed. Make sure not to modify code outside of the designated area."

If I change function name to "convertToTransportBureau", save works fine without other changes.

Expected Behavior

Expected Behavior:

Save works fine, or give appropriate error message such as "Function signature is too long."

Steps to Reproduce

• Create enum "TransportBureau"
• Create custom function:
  • name: "convertStringToTransportBureau"
  • Return type: TransportBureau (Nullable)
  • Argument: transportBureauString (String/ Nullable)
• Edit function body returns null
• Click Save

Reproducible from Blank

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

Bug Report Code (Required)

IT4wls/qx412rtxE17rAccFv+TwWGDs5aucele1hRis8JJToPLAUZ8zBM05vZr3nTHxme1n8pHoy/PfqiPOXUPU7ByuYRaJZzpdqZwzMTkOhMKqvDLiJfW1STMRgChWf07S4ngknBNt2WHAS112QfueycC7aN7rGOWojH/2LKdeK2SrDX1iXc2URm05KZDPz

Visual documentation

Environment

- FlutterFlow version: 5.1.3
- Platform: Web
- Browser name and version: Using macOS FF native editor
- Operating system and version affected: macOS 14.5（23F79）

Additional Information

No response

[Alezanello]

Hello!

I wasn't able to replicate the issue. I created a function with a long name, and it saved correctly without any problems. It’s possible that the function itself had an issue earlier, or the system didn’t detect it until you changed the name and synced properly.

Let me know if the issue happens again, and I’d be happy to investigate further!

[satoshikumano]

@Alezanello

Thank you for your confirmation.

It seems the length of function name is not the factor of the bug.
I could reproduce the issue in the blank project with following steps.
Could you confirm the same steps?

• Create blank project.
• Create Enum: TransportBureau with values "aaaaaa", "bbbbbb"
• Create Custom function:
  • Name: convertStringToTransportBureau
  • Return type: TransportBureau (Nullable)
  • Argument:
    • Name: transportBureauString
    • Type: String (Nullable)
  • Function body: just return null
• Save function.

"The function is empty or cannot be parsed. Make sure not to modify code outside of the designated area."

If I change name to convertTransportBureau, save works fine.

[Alezanello]

Hello again!

I believe the main issue here isn’t just about being able to save the function, but rather a potential issue with the custom function itself. It seems that changing the function name might be overriding an underlying error, allowing you to save it.

From my understanding, FlutterFlow doesn’t support returning null for an Enum. I recommend recreating the function with the "nullable" option disabled and ensuring that it always returns a default Enum value.

This should allow the function to save properly without requiring a name change as a workaround. Let me know if you run into any issues!

[satoshikumano]

@Alezanello

Hello.

FlutterFlow doesn’t support returning null for an Enum

Flutter Flow UI allows it. Should not use this functionality?

[Alezanello]

I'll take a look at that! In the meantime, try adding an .empty status inside the enum, and instead of returning null, return the .empty enum value.

[Alezanello]

Hello again!

Did the solution provided help resolve the issue?