Flutterflow seems unable to detect data type

Actions & Logic

I am creating a simple custom function to calculate two different timestamp with return value as integer (seconds). Then I am about to use in it conditional actions to see whether the timestamp range is less than 3600 seconds.

But when I put that custom function in conditional action, flutterflow can't read its integer return value, but string instead.

Is there any something I missed?

Screen Recording 2025-06-09 at 3.46.21 PM.mov
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What have you tried so far?

Checking documentation

Did you check FlutterFlow's Documentation for this topic?
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