collectd.security-level defaults to empty string, which is invalid

I'm trying to receive collectd inputs to influxdb, but when i try to restart the service i get the following message:

influxdb0 influxd[24391]: run: invalid collectd config: Invalid security level. To generate a valid configuration file run influxd config > influxdb.generated.conf

My influx.conf is exactly like the documentation:

[[collectd]]
enabled = true
bind-address = ":25826"
database = "collectd"
retention-policy = ""
batch-size = 5000
batch-pending = 10
batch-timeout = "10s"
read-buffer = 0
typesdb = "/usr/share/collectd/types.db"
security-level = "none"
parse-multivalue-plugin = "split"

Worth mentioning that my security-level is defined as none, both in my influx.conf and in my collectd.conf (wich is running perfectly):

      LoadPlugin network
      
      <Plugin "network">
        <Server "my_influxdb_server" "25826">
          SecurityLevel "None"
        </Server>
        ReportStats true
      </Plugin>

So, in theory, there would be no reason to display this message.

• System info: Linux 4.15.0-1040-gcp x86_64
• InfluxDB version: InfluxDB v1.7.7

Start with the collectd configuration path invoked by influxd config and compare its security-level default with the documented influx.conf and the reported collectd.conf. Reproduce the invalid empty-string configuration on InfluxDB v1.7.7, then verify that generated and loaded configurations use a valid security level and no longer emit the startup error.