# Ruby exception occurred: undefined method \`\*' for nil:NilClass

**URL:** https://discuss.elastic.co/t/ruby-exception-occurred-undefined-method-for-nil-nilclass/84477
**Category:** Logstash
**Created:** [May 4, 2017, 3:14am UTC](https://discuss.elastic.co/t/ruby-exception-occurred-undefined-method-for-nil-nilclass/84477 "2017-05-04T03:14:20Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![jiyu3268891](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@jiyu3268891](https://discuss.elastic.co/u/jiyu3268891)
#### Post date: [May 4, 2017, 3:14am UTC](https://discuss.elastic.co/t/ruby-exception-occurred-undefined-method-for-nil-nilclass/84477/1 "2017-05-04T03:14:20Z")

</div>

filter {

```
grok {
match => ["message", "%{TIMESTAMP_ISO8601:a} %{WORD} %{USER}] %{WORD} %{WORD} %{WORD:keyvalue}"]
add_tag => "warn"
}
metrics
{
meter => "events.%{keyvalue}"
add_tag => "metric"
ignore_older_than => 10
}
if "metric" in [tags] {
ruby {
        code => "event.cancel if event.get('events.all.rate_1m') * 60 < 5"
    }
}

```

}

The error is  
[2017-05-04T03:13:32,431][ERROR][logstash.filters.ruby] Ruby exception occurred: undefined method `\*' for nil:NilClass  
I don't know where is not correct.

---

<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 4, 2017, 5:20am UTC](https://discuss.elastic.co/t/ruby-exception-occurred-undefined-method-for-nil-nilclass/84477/2 "2017-05-04T05:20:31Z")

</div>

Subfields are referenced via `[field][subfield]`, not `field.subfield`, so you need to adjust your `event.get` call.

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<div class="post-metadata">

### Author: ![jiyu3268891](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@jiyu3268891](https://discuss.elastic.co/u/jiyu3268891)
#### Post date: [May 4, 2017, 9:25am UTC](https://discuss.elastic.co/t/ruby-exception-occurred-undefined-method-for-nil-nilclass/84477/3 "2017-05-04T09:25:03Z")

</div>

Thank you， I have changed by code =\> "event.cancel if event['events.all']['rate\_1m'] \* 60 \< 5"

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<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: [June 1, 2017, 9:31am UTC](https://discuss.elastic.co/t/ruby-exception-occurred-undefined-method-for-nil-nilclass/84477/4 "2017-06-01T09:31:43Z")

</div>

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