kafka sink connector. How insert record_key to table if record_value = null? - postgresql

Question

I have a topic where the data is only record_key and the record_value is null. I need to write the fields from the record_key to the table through the sink connector, but I get an error. How do I insert values from a record_key, ignoring record_value = null?
{
"name": "ObjectForDelete.sink",
"connector.class": "io.confluent.connect.jdbc.JdbcSinkConnector",
"transforms": [
"uuid",
"name"
],
"topics": [
"ObjectForDeletePG"
],
"transforms.uuid.type": "org.apache.kafka.connect.transforms.InsertField$Key",
"transforms.uuid.topic.field": "key.uuid",
"transforms.name.type": "org.apache.kafka.connect.transforms.InsertField$Key",
"transforms.name.topic.field": "key.name",
"connection.url": "jdbc:postgresql://127.0.0.1:5432/ulk",
"connection.user": "root",
"connection.password": "****",
"dialect.name": "PostgreSqlDatabaseDialect",
"insert.mode": "insert",
"table.name.format": "ObjectForDelete",
"pk.mode": "none",
"pk.fields": [],
"db.timezone": "Europe/Kiev"
}
ERROR:
Caused by: org.apache.kafka.connect.errors.ConnectException: Sink connector 'ObjectForDelete.sink' is configured with 'delete.enabled=false' and 'pk.mode=kafka' and therefore requires records with a non-null Struct value and non-null Struct schema, but found record at (topic='ObjectForDeletePG',partition=0,offset=0,timestamp=1623758581060) with a null value and null value schema.