# Logstash is dying with an Exception

**URL:** <https://discuss.elastic.co/t/logstash-is-dying-with-an-exception/154422>\
**Category:** Logstash\
**Created:** [October 29, 2018, 10:10am UTC](https://discuss.elastic.co/t/logstash-is-dying-with-an-exception/154422 "2018-10-29T10:10:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ashish\_Khare](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ashish_khare/32/46023_2.png) [@Ashish\_Khare](https://discuss.elastic.co/u/Ashish_Khare)\
**Post date:** [October 29, 2018, 10:10am UTC](https://discuss.elastic.co/t/logstash-is-dying-with-an-exception/154422/1 "2018-10-29T10:10:07Z")

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Hello,

I am running my logstash with 20g of jvm memory. But suddenly logstash is dying with following exception :

> Oct 29 09:54:11 prod-1-ap-southeast-1b-elk-node-006 logstash: [ERROR] 2018-10-29 09:54:11.708 [Ruby-0-Thread-145@[main]\>worker7: /usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:384] pipeline - Exception in pipelineworker, the pipeline stopped processing new events, please check your filter configuration and restart Logstash. {:pipeline\_id=\>"main", "exception"=\>"undefined method `to_hash_with_metadata' for nil:NilClass", "backtrace"=>["/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:273:in `block in merge'", "org/jruby/RubyArray.java:1734:in `each'", "org/jruby/RubyEnumerable.java:936:in `inject'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:272:in `merge'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:230:in `previous\_filter!'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:173:in `filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:in `do\_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:in `block in multi_filter'", "org/jruby/RubyArray.java:1734:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:in `multi_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:47:in `multi\_filter'", "(eval):129554:in `block in initialize'", "org/jruby/RubyArray.java:1734:in `each'", "(eval):129551:in `block in initialize'", "(eval):20297:in `block in filter\_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:447:in `filter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:426:in `worker\_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385:in `block in start_workers'"], :thread=>"#<Thread:0x5bd35d3c@/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:246 sleep>"} Oct 29 09:54:11 prod-1-ap-southeast-1b-elk-node-006 logstash: [FATAL] 2018-10-29 09:54:11.772 [LogStash::Runner] runner - An unexpected error occurred! {:error=>#<NoMethodError: undefined method `to\_hash\_with\_metadata' for nil:NilClass\>, :backtrace=\>["/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:273:in `block in merge'", "org/jruby/RubyArray.java:1734:in `each'", "org/jruby/RubyEnumerable.java:936:in `inject'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:272:in `merge'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:230:in `previous_filter!'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-multiline-3.0.4/lib/logstash/filters/multiline.rb:173:in `filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:in `do_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:in `block in multi\_filter'", "org/jruby/RubyArray.java:1734:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:in `multi\_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter\_delegator.rb:47:in `multi_filter'", "(eval):129554:in `block in initialize'", "org/jruby/RubyArray.java:1734:in `each'", "(eval):129551:in `block in initialize'", "(eval):20297:in `block in filter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:447:in `filter\_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:426:in `worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385:in `block in start\_workers'"]}`

Can you please help ?

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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:** [November 26, 2018, 10:10am UTC](https://discuss.elastic.co/t/logstash-is-dying-with-an-exception/154422/2 "2018-11-26T10:10:08Z")

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