Logstash Crashed:NoMethodError: undefined method `map_cleanup' for nil:NilClass start at /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-multiline-2.0.11/lib/logstash/codecs/identity_map_codec.rb:55

You asked the exact same question five weeks ago and I responded with a reference to a GitHub issue: Logstash crashing:NoMethodError: undefined method `map_cleanup' for nil:NilClass