# Logstash got error message "no implicit conversion of nil into String"

**URL:** https://discuss.elastic.co/t/logstash-got-error-message-no-implicit-conversion-of-nil-into-string/257440
**Category:** Logstash
**Created:** [December 3, 2020, 3:11am UTC](https://discuss.elastic.co/t/logstash-got-error-message-no-implicit-conversion-of-nil-into-string/257440 "2020-12-03T03:11:21Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![algo\_msh](https://avatars.discourse-cdn.com/v4/letter/a/b19c9b/32.png) [@algo\_msh](https://discuss.elastic.co/u/algo_msh)
#### Post date: [December 3, 2020, 3:11am UTC](https://discuss.elastic.co/t/logstash-got-error-message-no-implicit-conversion-of-nil-into-string/257440/1 "2020-12-03T03:11:21Z")

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```auto
[2020-12-03T01:22:03,474][ERROR][logstash.outputs.elasticsearch] An unknown error occurred sending a bulk request to Elasticsearch. We will retry indefinitely {:error_message=>"no implicit conversion of nil into String", :error_class=>"TypeError", 

```

i'm new to ELK here is the error message and error suddenly happened since last Monday, and Kibana did not make new indices

i used aws-elastic-search6.7 and logstash version 6.7

---

<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: [December 31, 2020, 3:11am UTC](https://discuss.elastic.co/t/logstash-got-error-message-no-implicit-conversion-of-nil-into-string/257440/2 "2020-12-31T03:11:30Z")

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