LS crashing when trying to read CSV with undefined method `tv_sec' error

Elastic Stack Logstash
2

When i change the filter config like this:

 if [type] == "enriched_event" {
     csv {
         columns => ["timestamp","service_id","provisioning_id","contract_id","artikelnummer","featurenummer","duration"]
         separator => "|"
     }
}

(removing the @ in timestamp) i'm able to forward my csv log to ES but a new @timestamp field is created with the current date/time. In Kibana, i can still use my own timestamp field. But i'm still lacking in knowledge regarding the @timestamp field :frowning: