Problem trying to show error message with prism and node - node.js

Question

I'm doing the backend of a ToDo's project, and for that I'm using the prism orm, the node framework, the typescript language and to test the project I'm using insomnia. i already did all the methods i wanted (create ToDo, get ToDo's, delete ToDo, change ToDo task, change ToDo title) and they are all working, but when i went to test the error message that would occur when i tried to create a ToDo that already exists, in insomia it gives the following message:
Error: Server returned nothing (no headers, no data)
And in VsCode:
[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "#<AppError>".] {
code: 'ERR_UNHANDLED_REJECTION'
}
I made the code as follows:
export class AppError {
public readonly message: string;
public readonly statusCode: number;
constructor(message: string, statusCode = 400) {
this.message = message
this.statusCode = statusCode
}
}
import { AppError } from "../../errors/AppError";
import { prisma } from "../../client/prismaClient";
import { CreateToDoType } from "../Types/CreateToDoType";
export class createToDoUseCase {
async execute({title, task}: CreateToDoType) {
const todoAlreadyExists = await prisma.toDo.findUnique({
where: {
title: title
}
})
if (!todoAlreadyExists) {
const newToDo = await prisma.toDo.create({
data: {
title: title,
task: task
}
})
return newToDo
} else {
console.log("01 4")
throw new AppError("Error! ToDo already exists") //aqui está o erro
}
}
}
import {Request, Response} from "express"
import { createToDoUseCase } from "../UseCases/CreateToDoUseCases"
export class createToDoController {
async handle(req: Request, res: Response) {
const { title, task } = req.body
const CreateToDoUseCases = new createToDoUseCase()
const result = await CreateToDoUseCases.execute({title, task}) // aqui está o erro
return res.status(201).json(result)
}
}