╷│ Error: Invalid function argument│ │   on .terraform/modules/pg.this.cloud_psql/modules/postgresql/read_replica.tf line 40, in resource "google_sql_database_instance" "replicas":│   40:   encryption_key_name  = (join("-", slice(split("-", lookup(each.value, "zone", var.zone)), 0, 2))) == var.region ? null : each.value.encryption_key_name│     ├────────────────│     │ while calling split(separator, str)│     │ each.value is object with 16 attributes│     │ var.zone is null│ │ Invalid value for "str" parameter: argument must not be null.╵