# Undefined method for NilClass in buffer\_flush
**URL:** https://discuss.elastic.co/t/undefined-method-for-nilclass-in-buffer-flush/49944
**Category:** Logstash
**Created:** [May 12, 2016, 10:15pm UTC](https://discuss.elastic.co/t/undefined-method-for-nilclass-in-buffer-flush/49944 "2016-05-12T22:15:10Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@WillBradley](https://discuss.elastic.co/u/WillBradley)
#### Post date: [May 12, 2016, 10:15pm UTC](https://discuss.elastic.co/t/undefined-method-for-nilclass-in-buffer-flush/49944/1 "2016-05-12T22:15:10Z")
Just encountered this error in my logs, Logstash crashed immediately afterwards. Not sure if it's an output-sqs or a stud / buffer issue.
> May 11 15:22:09 logstash.err: NoMethodError: undefined method `' for nil:NilClass
> May 11 15:22:09 logstash.err: buffer\_flush at /opt/logstash/vendor/bundle/jruby/1.9/gems/stud-0.0.22/lib/stud/buffer.rb:186
> May 11 15:22:09 logstash.err: close at /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-sqs-2.0.2/lib/logstash/outputs/sqs.rb:135
> May 11 15:22:09 logstash.err: do\_close at /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.1.3-java/lib/logstash/plugin.rb:36
> May 11 15:22:09 logstash.err: each at org/jruby/RubyArray.java:1613
> May 11 15:22:09 logstash.err: outputworker at /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.1.3-java/lib/logstash/pipeline.rb:282
> May 11 15:22:09 logstash.err: each at org/jruby/RubyArray.java:1613
> May 11 15:22:09 logstash.err: outputworker at /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.1.3-java/lib/logstash/pipeline.rb:281
> May 11 15:22:09 logstash.err: start\_outputs at /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.1.3-java/lib/logstash/pipeline.rb:194
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:57am UTC](https://discuss.elastic.co/t/undefined-method-for-nilclass-in-buffer-flush/49944/2 "2017-07-06T04:57:47Z")