I’m building a midia tracker with Spring Boot with GraphQL, but I when I try to send a mutation to create a user, flowing error is throw:

java.lang.NullPointerException: Cannot invoke "com.espacogeek.geek.inputs.UserInput.password()" because "userInput" is null

Because when a debug UserInput is null when registerUser() is called, what I doing wrong to GraphQL doesn’t populate UserInput? Can someone help me please?
If you need more information please tell me.

Code:

user.graphqls:

type Query {
    findUserByUsername(username: String!): User
    findUserById(id: ID!): User
    findUserByEmail(email: String!): User
}

type Mutation {
    registerUser(user: UserInput!): User
}

type User {
    id: ID
    username: String
    email: String
}

input UserInput {
    username: String!
    email: String!
    password: String!
}

UserInput.java

package com.espacogeek.geek.inputs;

public record UserInput(String username, String email, String password) {}

UserController.java

package com.espacogeek.geek.controllers;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.graphql.data.method.annotation.MutationMapping;
import org.springframework.stereotype.Controller;

import com.espacogeek.geek.inputs.UserInput;
import com.espacogeek.geek.modals.UserModal;
import com.espacogeek.geek.services.User.UserService;

import at.favre.lib.crypto.bcrypt.BCrypt;

@Controller
public class UserController {
    @Autowired
    private UserService userService;

    //Some codes...

    @MutationMapping
    public UserModal registerUser(@Argument UserInput userInput) {
        var passwordCrypted = BCrypt.withDefaults().hash(12, userInput.password().toCharArray());
        UserModal user = new UserModal(null, userInput.username(), userInput.email(), passwordCrypted);
        return userService.save(user);
    }
}