# Error on an external ruby script

**URL:** <https://discuss.elastic.co/t/error-on-an-external-ruby-script/261069>\
**Category:** Logstash\
**Created:** [January 14, 2021, 2:32am UTC](https://discuss.elastic.co/t/error-on-an-external-ruby-script/261069 "2021-01-14T02:32:31Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ElasticLiver](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/elasticliver/32/64869_2.png) [@ElasticLiver](https://discuss.elastic.co/u/ElasticLiver)\
**Post date:** [January 14, 2021, 2:32am UTC](https://discuss.elastic.co/t/error-on-an-external-ruby-script/261069/1 "2021-01-14T02:32:31Z")

</div>

Hi im getting the following error in an external ruby code:

```auto
Could not process event: undefined method `[]' for nil

```

not every key in this hash, exist on the data being consumed by logstash, so I added a conditional that check if the "nodo" is empty, if it is empty do nothing, else get the values , but still is not working

```auto
def register(params)
end
def filter(event)
grp = {
"b_518" => ["Switch", "XVI", "CHI", "518_CHI","noaplica", "en produccion"],
...(more hashes)....
"b_520" => ["Switch", "XVI", "CHI", "520_CHI","noaplica", "en produccion"],
};

nodo = event.get("node\sname")

if nodo.nil? || nodo.empty?
else
tci = grp[nodo][0]
reg = grp[nodo][1]
comu = grp[nodo][2]
suc = grp[nodo][3]
pro = grp[nodo][4]
sta = grp[nodo][5]

event.set('tipo_ci', tci)
event.set('region', reg)
event.set('comuna', comu)
event.set('sucursal', suc)
event.set('proveedor', pro)
event.set('status', sta)
return [event]

end
end

```

what Im doing wrong?

---

<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:** [February 11, 2021, 2:32am UTC](https://discuss.elastic.co/t/error-on-an-external-ruby-script/261069/2 "2021-02-11T02:32:39Z")

</div>

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