Logstash generating exception in pipeline worker

Hi ,
when i run the logstash in the debug mode, it is generating error as the below.Can i please know whether the error is due to the wrong filter or not using of persistent queues.

Exception in pipelineworker, the pipeline stopped processing new events, please check your filterash. {"exception"=>"undefined method `to_hash' for []:Array", "backtrace"=>["(eval):126:in `filter_func'", "/root/logstash-aap/logstash-core/lib/logstash/pip "/root/logstash-aap/logstash-core/lib/logstash/pipeline.rb:379:in `worker_loop'", "/root/logstash-aap/logstash-core/lib/logstash/pipeline.rb:342:in `start_w
[FATAL] 2017-10-19 13:40:19.011 [LogStash::Runner] runner - An unexpected error occurred! {:error=>#<NoMethodError: undefined method `to_hash' for []:Array>,lter_func'", "/root/logstash-aap/logstash-core/lib/logstash/pipeline.rb:398:in `filter_batch'", "/root/logstash-aap/logstash-core/lib/logstash/pipeline.rb:37tash-aap/logstash-core/lib/logstash/pipeline.rb:342:in `start_workers'"]}

This is a bug in Logstash 5.6.3. Downgrade to 5.6.2 for now.

Thank you..

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