A suspended Future has become unpaused while the widget tree was building in Flutter: Causes and How to Fix

Utilize async, await Correctly

• Ensure all async functions use the await keyword when calling other async functions. This guarantees that function execution pauses until the async operation completes.
• Revisit any Futures being built within the widget tree and encapsulate them with the await keyword whenever necessary.

Future<void> fetchData() async {
  // Correct usage
  await Future.delayed(Duration(seconds: 2));
}

Use FutureBuilder Widget

• Utilize the FutureBuilder widget for managing async data within the widget tree, providing a stable way to handle connections to Futures.
• Only perform state-affecting operations (like setState calls) when the connectionState is ConnectionState.done.

FutureBuilder<String>(
  future: fetchData(),
  builder: (context, snapshot) {
    if (snapshot.connectionState == ConnectionState.done) {
      if (snapshot.hasError) {
        return Text('Error: ${snapshot.error}');
      }
      return Text('Result: ${snapshot.data}');
    } else {
      return CircularProgressIndicator();
    }
  },
)

Manage State Appropriately

• Track the state separately from async processes by using state management solutions like Provider, Bloc, or StateNotifier.
• Avoid performing direct UI updates as part of async functions. Instead, use dedicated state management solutions to notify UI changes.

final ValueNotifier<String> resultNotifier = ValueNotifier<String>('');

void asyncOperation() async {
  try {
    final result = await fetchSomeData();
    resultNotifier.value = result;
  } catch (e) {
    resultNotifier.value = 'Error occurred';
  }
}

Implement Error Handling

• Incorporate comprehensive error handling strategies in async functions using try-catch blocks.
• Log errors and consider user-friendly messages when exceptions occur to prevent disruptions in the widget tree rendering process.

void exampleFunction() async {
  try {
    await someAsyncFunction();
  } catch (error) {
    print('An error occurred: $error');
  }
}

Check for Infinite Recursion

• Analyze recursive functions or multiple chained Futures to ensure they eventually complete.
• Add appropriate termination conditions to prevent infinite loops or endless async calls in recursively designed functions.

int calculateFactorial(int n) {
  if (n <= 1) return 1;
  return n * calculateFactorial(n - 1);
}

Monitor Flutter Framework Version

• Keep the Flutter framework updated to leverage bug fixes and improvements, potentially mitigating unexpected behavior.
• Test projects for compatibility with the latest stable channel updates.

flutter upgrade

Ensure Resource Disposal

• Release resources or cancel async listeners effectively using lifecycle-aware widgets like StatefulWidget and managing resources in the dispose method.
• Address potential memory leaks by ensuring components are cleaned up properly before unmounting.

@override
void dispose() {
  // Dispose any streams or other resources.
  super.dispose();
}