Unhandled exception leads to app crash.

[awaik]

When I create a transaction with the wrong utxo's - app crashes on the line

final TxBuilderResult txBuilderResultPreRes = await txBuilderPre.finish(wallet);

      final txBuilderPre = TxBuilder();

      List<(dynamic, int)> outputs = [];
      for (final fundOutput in fundOutputs) {
        final Address addressModel = await Address.create(address: fundOutput.address);
        final script = await addressModel.scriptPubKey();
        outputs.add((script, fundOutput.amount));
      }

      /// Pre-calculate fees amount
      TxBuilder txBuilderResultPre = txBuilderPre.feeRate(feeRate).manuallySelectedOnly().addUtxos(utxos);
      for (final output in outputs) {
        txBuilderResultPre = txBuilderResultPre.addRecipient(output.$1, output.$2);
      }

      final TxBuilderResult txBuilderResultPreRes = await txBuilderPre.finish(wallet);

with the message

thread 'frb_workerpool' panicked at src/r_api.rs:196:41:
called `Result::unwrap()` on an `Err` value: UnknownUtxo
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
* thread #42, name = 'frb_workerpool', stop reason = signal SIGABRT
    frame #0: 0x00000001eabdc200 libsystem_kernel.dylib`__pthread_kill + 8
libsystem_kernel.dylib`:
->  0x1eabdc200 <+8>:  b.lo   0x1eabdc220               ; <+40>
    0x1eabdc204 <+12>: pacibsp 
    0x1eabdc208 <+16>: stp    x29, x30, [sp, #-0x10]!
    0x1eabdc20c <+20>: mov    x29, sp
Target 0: (Runner) stopped.
Lost connection to device.

With correct utxo's this code works well.

1. iOS 16.1.2
2. bdk_flutter: ^0.30.0

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.19.2, on macOS 14.4 23E214 darwin-arm64, locale
en-DE)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.3)
[✓] IntelliJ IDEA Community Edition (version 2022.2.2)
[✓] VS Code (version 1.87.2)
[✓] Connected device (4 available)
[✓] Network resources

• No issues found!

[awaik]

And one more

thread 'frb_workerpool' panicked at src/types.rs:56:53:
Invalid Psbt Input: Error("key must be a string", line: 1, column: 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
* thread #42, name = 'frb_workerpool', stop reason = signal SIGABRT
    frame #0: 0x00000001c534c200 libsystem_kernel.dylib`__pthread_kill + 8
libsystem_kernel.dylib`:
->  0x1c534c200 <+8>:  b.lo   0x1c534c220               ; <+40>
    0x1c534c204 <+12>: pacibsp 
    0x1c534c208 <+16>: stp    x29, x30, [sp, #-0x10]!
    0x1c534c20c <+20>: mov    x29, sp
Target 0: (Runner) stopped.
Lost connection to device.