Cannot read properties of undefined reading 'getEntityValue' typeorm - postgresql

Question

I am creating a nestjs project with typeorm and postgresql. Here I am creating a user entity.
My entity will be like
{
email: string,
name: string,
avatar: {
public_key: string;
url: string;
}
}
In avatar column I need to add a object with public_key and url.
I create two entity like this-
#Entity()
class Avatar {
#Column({ type: "text", nullable: true })
public_key: string;
#Column({ type: "text", nullable: true })
url: string;
}
#Entity()
#Tree("closure-table")
export class User {
#PrimaryGeneratedColumn()
id: number;
#Column({ type: "text", nullable: false })
userName: string;
#Column({ type: "text", nullable: false })
email: string;
#Column({ type: "text", nullable: false })
firstName: string;
#Column({ type: "text", nullable: false })
lastName: string;
#Column({ type: "text", nullable: false, select: false })
password: string;
#Column({ type: "text", nullable: true })
socket_id: string;
#Column({ type: "text", nullable: true, select: false })
otp: string;
#TreeChildren()
avatar: Avatar;
#Column({ type: "boolean", default: false, nullable: false })
is_verify: boolean;
#CreateDateColumn()
created_at: Date;
#UpdateDateColumn()
updated_at: Date;
//Before Insert Injection
#BeforeInsert()
createUserName() {
this.userName = uniqid.time()
}
}
Here I use closure-table to do nested avatar entity
Here I write
#TreeChildren()
avatar: Avatar;
For nesting Avatar Entity
Then in my controller I try to create my first data-
const result = await this.userRepository.create({
...userInput,
otp: secret.base32,
password: passwordHash,
});
await this.userRepository.save(result)
Note: avatar field is not required. Avatar field will be add when user update their profile. Here I only create first user data.
But I am getting this error-
Cannot read properties of undefined (reading 'getEntityValue')
Additionally, here is my userInput
#InputType()
export class UserInput {
#Field(() => String, { nullable: false })
#IsString()
#IsEmail()
#IsNotEmpty()
email: string;
#Field(() => String, { nullable: false })
#IsString()
#IsNotEmpty()
firstName: string;
#Field(() => String, { nullable: false })
#IsString()
#IsNotEmpty()
lastName: string;
#Field(() => String, { nullable: false })
#IsString()
#MinLength(8)
#MaxLength(20)
#IsNotEmpty()
#Matches(/^.*(?=.{4,10})(?=.*\d)(?=.*[a-zA-Z]).*$/, { message: "password too weak" })
password: string
}
Please help me. I need this is very much. Over 10 days, I can't solve this. Please help me.