Exception inside SubscribeCallback is getting ignored

[SowmyaAmagi]

    local_callback = Pubnub::SubscribeCallback.new(
      message: ->(envelope) {
        request = envelope.result[:data][:message]
        Rails.logger.info("subscribe: RECEIVED MESSAGE - #{request}")
        if request["error"].present?
          raise StandardError.new("failed to process message")
        end
      },
      status: lambda do |envelope|
        if envelope.status[:code] != 200
          Rails.logger.error("subscribe: Pubnub error (#{envelope.status[:category]}): #{envelope.status[:server_response].body.strip}.")
        else
          Rails.logger.info("subscribe: subscribed to #{envelope.status[:subscribed_channels]} with uuid #{envelope.status[:config][:uuid]}")
        end
      end
    )
    pubnub.add_listener(callback: local_callback)
    pubnub.subscribe(
      channels: channels
    )

https://github.com/pubnub/ruby/blob/v4.2.5/lib/pubnub/subscriber.rb#L288

When application raise's an exception inside SubscribeCallback pubnub is silently ignoring it.