{"action":"closed","issue":{"url":"https://api.github.com/repos/elastic/logstash/issues/3125","labels_url":"https://api.github.com/repos/elastic/logstash/issues/3125/labels{/name}","comments_url":"https://api.github.com/repos/elastic/logstash/issues/3125/comments","events_url":"https://api.github.com/repos/elastic/logstash/issues/3125/events","html_url":"https://github.com/elastic/logstash/issues/3125","id":71652185,"number":3125,"title":"Exception in filterworker {\"exception\"=>#<NameError: undefined local variable or method `event'","user":{"login":"rmoff","id":3671582,"avatar_url":"https://avatars.githubusercontent.com/u/3671582?v=3","gravatar_id":"","url":"https://api.github.com/users/rmoff","html_url":"https://github.com/rmoff","followers_url":"https://api.github.com/users/rmoff/followers","following_url":"https://api.github.com/users/rmoff/following{/other_user}","gists_url":"https://api.github.com/users/rmoff/gists{/gist_id}","starred_url":"https://api.github.com/users/rmoff/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rmoff/subscriptions","organizations_url":"https://api.github.com/users/rmoff/orgs","repos_url":"https://api.github.com/users/rmoff/repos","events_url":"https://api.github.com/users/rmoff/events{/privacy}","received_events_url":"https://api.github.com/users/rmoff/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-04-28T17:30:14Z","updated_at":"2015-04-28T17:32:20Z","closed_at":"2015-04-28T17:32:20Z","body":"logstash 1.5.0-rc3 running under java version \"1.8.0_45\"\r\n\r\nConfig worked fine on logstash 1.5.0-rc1, now errors out: \r\n\r\n```Exception in filterworker {\"exception\"=>#<NameError: undefined local variable or method `event' for #<LogStash::Pipeline:0x5bf514af>>, \"backtrace\"=>[\"(eval):55:in `initialize'\", \"org/jruby/RubyProc.java:271:in `call'\", \"/hdd/ELK/logstash-1.5.0-rc3/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.0.rc3-java/lib/logstash/pipeline.rb:309:in `flush_filters'\", \"org/jruby/RubyArray.java:1613:in `each'\", \"/hdd/ELK/logstash-1.5.0-rc3/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.0.rc3-java/lib/logstash/pipeline.rb:308:in `flush_filters'\", \"/hdd/ELK/logstash-1.5.0-rc3/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.0.rc3-java/lib/logstash/pipeline.rb:317:in `flush_filters_to_output!'\", \"/hdd/ELK/logstash-1.5.0-rc3/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.0.rc3-java/lib/logstash/pipeline.rb:223:in `filterworker'\", \"org/jruby/ext/thread/Mutex.java:149:in `synchronize'\", \"/hdd/ELK/logstash-1.5.0-rc3/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.0.rc3-java/lib/logstash/pipeline.rb:223:in `filterworker'\", \"/hdd/ELK/logstash-1.5.0-rc3/vendor/bundle/jruby/1.9/gems/logstash-core-1.5.0.rc3-java/lib/logstash/pipeline.rb:156:in `start_filters'\"], :level=>:error}```\r\n\r\nNarrowed it down to this line: \r\n\r\n`mutate { gsub => ['message', \"\\n\", \"--NL--\"] }`\r\n\r\nfollowing a `multiline`\r\n\r\nI'm trying to create a reproducible test case, but it's definitely the above that if I remove it doesn't bomb out.  "}}