RealmKotlin: Compile error “a RealmList field cannot be marked as nullable”

Hi.
I migrated my Android Kotlin app from RealmJava to RealmKotlin and I have some optional RealmList fields in my DTOs, but RealmKotlin tells me that “a RealmList field cannot be marked as nullable”. I want to be able to use my realms without a migration to make them REQUIRED. Is there a way?