# Logstash Split Filter Error **URL:** \ **Category:** Logstash\ **Created:** [October 29, 2018, 1:48pm UTC](https://discuss.elastic.co/t/logstash-split-filter-error/154452 "2018-10-29T13:48:50Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![michael1412](https://avatars.discourse-cdn.com/v4/letter/m/ecd19e/32.png) [@michael1412](https://discuss.elastic.co/u/michael1412)\ **Post date:** [October 29, 2018, 1:48pm UTC](https://discuss.elastic.co/t/logstash-split-filter-error/154452/1 "2018-10-29T13:48:51Z")
> - System: CentOS 7 > - Logstash Version: 5.5 > - Config: ``` if [stats] { # check type of stats if is array ruby { code => 'case event.get("[stats]") when Hash event.tag("stats_object") else event.tag("stats_array") end ' } ruby { code => "event.set('stats.length',event.get('stats').length)" } if [stats.length] == 0 { mutate { add_tag => ["zero_array"] } } if "stats_object" in [tags] { json{ source =>"stats" skip_on_invalid_json => "true" } } # if it is an array, it needs to be split into seperated messages if "stats_array" in [tags] and [stats.length] > 0 { split { field => "stats" } mutate { add_tag => ["array_split"] } } } ``` > - Error: ```auto [2018-10-28T22:50:41,365][ERROR][logstash.pipeline] Exception in pipelineworker, the pipeline stopped processing new events, please check your filter configuration and restart Logstash. {"exception"=>"undefined method `empty?' for nil:NilClass", "backtrace"=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-split-3.1.4/lib/logstash/filters/split.rb:89:in `filter'", "org/jruby/RubyArray.java:1613:in `each'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-split-3.1.4/lib/logstash/filters/split.rb:88: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 `multi_filter'", "org/jruby/RubyArray.java:1613: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:46:in `multi_filter'", "(eval):1277991:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):1277988:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):1278024:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):1278017:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):1278044:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):1278037:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):74718:in `filter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:399:in `filter_batch'", "org/jruby/RubyProc.java:281:in `call'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:228:in `each'", "org/jruby/RubyHash.java:1342:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:227:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:398:in `filter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:379:in `worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:342:in `start_workers'"]} [2018-10-28T22:50:41,538][FATAL][logstash.runner] An unexpected error occurred! {:error=>#<NoMethodError: undefined method `empty?' for nil:NilClass>, :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-split-3.1.4/lib/logstash/filters/split.rb:89:in `filter'", "org/jruby/RubyArray.java:1613:in `each'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-split-3.1.4/lib/logstash/filters/split.rb:88: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 `multi_filter'", "org/jruby/RubyArray.java:1613: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:46:in `multi_filter'", "(eval):1277991:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):1277988:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):1278024:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):1278017:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):1278044:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):1278037:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):74718:in `filter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:399:in `filter_batch'", "org/jruby/RubyProc.java:281:in `call'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:228:in `each'", "org/jruby/RubyHash.java:1342:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:227:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:398:in `filter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:379:in `worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:342:in `start_workers'"]} ``` What could be the reason for this kind of failure? ---
**Author:** ![paz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/paz/32/28003_2.png) [@paz](https://discuss.elastic.co/u/paz)\ **Post date:** [October 29, 2018, 2:42pm UTC](https://discuss.elastic.co/t/logstash-split-filter-error/154452/2 "2018-10-29T14:42:36Z")
Seems like it is caused by a bug in the split filter, where sometimes an array containing null values was not handled properly. It's apparently fixed on version 3.1.6 as per [https://github.com/logstash-plugins/logstash-filter-split/pull/31](https://github.com/logstash-plugins/logstash-filter-split/pull/31) ---
**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, 2:42pm UTC](https://discuss.elastic.co/t/logstash-split-filter-error/154452/3 "2018-11-26T14:42:41Z")
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