# Concurrency causing Ruby Exception - logstash-5.4.3 **URL:** \ **Category:** Logstash\ **Created:** [October 25, 2018, 3:35am UTC](https://discuss.elastic.co/t/concurrency-causing-ruby-exception-logstash-5-4-3/153899 "2018-10-25T03:35:26Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![peruma.selvarasu](https://avatars.discourse-cdn.com/v4/letter/p/a6a055/32.png) [@peruma.selvarasu](https://discuss.elastic.co/u/peruma.selvarasu)\ **Post date:** [October 25, 2018, 3:35am UTC](https://discuss.elastic.co/t/concurrency-causing-ruby-exception-logstash-5-4-3/153899/1 "2018-10-25T03:35:26Z")
We are getting the below error in logstash-5.4.3. I am not seeing any transaction failure due to this issue. Is there any suggestion to fix the problem?? [2018-10-16T18:53:21,745][ERROR][logstash.filters.ruby] Ruby exception occurred: Detected invalid array contents due to unsynchronized modifications with concurrent users [2018-10-16T18:53:21,745][ERROR][logstash.filters.ruby] Ruby exception occurred: Detected invalid array contents due to unsynchronized modifications with concurrent users [2018-10-16T19:24:04,033][ERROR][logstash.filters.ruby] Ruby exception occurred: Detected invalid hash contents due to unsynchronized modifications with concurrent users [2018-10-16T19:24:04,033][ERROR][logstash.filters.ruby] Ruby exception occurred: Detected invalid hash contents due to unsynchronized modifications with concurrent users ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 22, 2018, 3:35am UTC](https://discuss.elastic.co/t/concurrency-causing-ruby-exception-logstash-5-4-3/153899/2 "2018-11-22T03:35:26Z")
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