# Logstash.filters.ruby \] Ruby exception occurred: undefined method \`\[\]' for nil:NilClass

**URL:** <https://discuss.elastic.co/t/logstash-filters-ruby-ruby-exception-occurred-undefined-method-for-nil-nilclass/141873>\
**Category:** Logstash\
**Created:** [July 27, 2018, 5:40am UTC](https://discuss.elastic.co/t/logstash-filters-ruby-ruby-exception-occurred-undefined-method-for-nil-nilclass/141873 "2018-07-27T05:40:59Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![prashansa1](https://avatars.discourse-cdn.com/v4/letter/p/a3d4f5/32.png) [@prashansa1](https://discuss.elastic.co/u/prashansa1)\
**Post date:** [July 27, 2018, 5:40am UTC](https://discuss.elastic.co/t/logstash-filters-ruby-ruby-exception-occurred-undefined-method-for-nil-nilclass/141873/1 "2018-07-27T05:40:59Z")

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When I'm writing this code in logstash file(.conf file) and executing, It is giving the value but with exception.

filter {   
ruby {  
code =\> "  
k= 0  
while k \<= 10 do  
Test=JSON.parse(response.body)['hits']['hits'][k]['\_source']['Test']  
puts Test  
k += 1  
end  
"  
}  
}

output;  
4  
logstash.filters.ruby ] Ruby exception occurred: undefined method `[]' for nil:NilClass

---

<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:** [July 27, 2018, 6:50pm UTC](https://discuss.elastic.co/t/logstash-filters-ruby-ruby-exception-occurred-undefined-method-for-nil-nilclass/141873/3 "2018-07-27T18:50:01Z")

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Please post the solution to the benefit of other people with this problem.

---

<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:** [August 27, 2018, 10:33am UTC](https://discuss.elastic.co/t/logstash-filters-ruby-ruby-exception-occurred-undefined-method-for-nil-nilclass/141873/5 "2018-08-27T10:33:25Z")

</div>

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