<JPA ObjectOptimisticLockingFailureException on an...

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JPA ObjectOptimisticLockingFailureException on an Insert sql execution followed by an Update sql execution
I'm using Spring-data-jpa with Kotlin and I faced this error:
org.springframework.orm.ObjectOptimisticLockingFailureException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1; statement executed

Here is my parent entity (unnecessary parts are omitted):
@Entity
class Parent(
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
val id: Long = 0L,

@OneToMany(mappedBy = "parent", cascade = [CascadeType.ALL], orphanRemoval = true)
val...