Web Reference: Apr 1, 2022 · I am getting this error in the console when I am trying to use flutter DropdownButton Widget. package:flutter/src/material/dropdown.dart': Failed assertion: line 1252 pos 12: 'widget.items!.where ( (DropdownMenuItem item) => item.value == widget.value).length == 1': is not true. Oct 24, 2025 · Frustrated by the Flutter DropdownButton 'exactly one item' error? We pinpoint the value mismatch cause with custom objects and async data. Implement the reliable solution using `Equatable` to build robust UIs and avoid technical debt. Jan 16, 2026 · This blog will guide you through implementing a dropdown list in Flutter from scratch, explain why this error occurs, and show you how to fix it. By the end, you’ll have a working dropdown and the confidence to avoid similar issues in the future.
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