# Logstash configure error?

**URL:** https://discuss.elastic.co/t/logstash-configure-error/50180
**Category:** Logstash
**Created:** [May 17, 2016, 5:42am UTC](https://discuss.elastic.co/t/logstash-configure-error/50180 "2016-05-17T05:42:56Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![Robert\_Wong](https://avatars.discourse-cdn.com/v4/letter/r/e8c25b/32.png) [@Robert\_Wong](https://discuss.elastic.co/u/Robert_Wong)
#### Post date: [May 17, 2016, 5:42am UTC](https://discuss.elastic.co/t/logstash-configure-error/50180/1 "2016-05-17T05:42:56Z")

</div>

hi,

i's my logstash filter conf,like this

```
if [url_M] == "isOldPasswordCorrect" {

        metrics {
           meter => ["passauth"]
           add_tag => "metric"
          }

          if "metric" in [tags] {

                ruby {

                        code => "event.cancel if event['passauth.rate_1m']*60 < 100"

              }
                }

        }

```

but when i test conf,the logstash say's

Ruby exception occurred: undefined method `\*' for nil:NilClass {:level=\>:error}

---

<div class="post-metadata">

### Author: ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [May 17, 2016, 7:01pm UTC](https://discuss.elastic.co/t/logstash-configure-error/50180/2 "2016-05-17T19:01:02Z")

</div>

The metrics filter produces nested fields and `passauth.rate_1m` isn't the right notation for nested fields. Try `event['passauth']['rate_1m']` instead (or `event['[passauth][rate_1m]']` if this is Logstash 5.0.

---

<div class="post-metadata">

### Author: ![Robert\_Wong](https://avatars.discourse-cdn.com/v4/letter/r/e8c25b/32.png) [@Robert\_Wong](https://discuss.elastic.co/u/Robert_Wong)
#### Post date: [May 18, 2016, 6:43am UTC](https://discuss.elastic.co/t/logstash-configure-error/50180/3 "2016-05-18T06:43:11Z")

</div>

thank you for you reply!

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:57am UTC](https://discuss.elastic.co/t/logstash-configure-error/50180/4 "2017-07-06T04:57:14Z")

</div>