Logstash with ruby command

Hello everyone I use ruby in my logstash to increase the value of the field by 1000 and I do it but in logstash logs I constantly see a message with error
[ERROR][logstash.filters.ruby ][main] Ruby exception occurred: undefined method `*' for nil:NilClass
tell how to solve this problem

That is telling you that you have an event in which the [request_time] field does not exist.

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