# Error in log - Serialization of Kafka metrics?

**URL:** https://community.hivemq.com/t/error-in-log-serialization-of-kafka-metrics/1371
**Category:** Uncategorized
**Created:** [August 24, 2022, 11:21am UTC](https://community.hivemq.com/t/error-in-log-serialization-of-kafka-metrics/1371 "2022-08-24T11:21:08Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Shaku](https://avatars.discourse-cdn.com/v4/letter/s/e19adc/32.png) [@Shaku](https://community.hivemq.com/u/Shaku)
#### Post date: [August 24, 2022, 11:21am UTC](https://community.hivemq.com/t/error-in-log-serialization-of-kafka-metrics/1371/1 "2022-08-24T11:21:08Z")

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Hi,

I’m getting the below error “Serialization of Kafka metrics”. My HiveMQ broker writes the messages to Kafka through pre-built Kafka extension. Can you specify why is this exception is shown and solution for the same? Does this exception occurs while HiveMQ is pushing data to Kafka extension or does this exception occurs while data is being pushed into HiveMQ ?

 ![image](https://canada1.discourse-cdn.com/flex035/uploads/hivemq1/original/1X/e625e1ebdc5a789efabe259af8a29daa594eb8c4.png)

Thanks

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### Author: ![Daria\_H](https://avatars.discourse-cdn.com/v4/letter/d/dfb087/32.png) [@Daria\_H](https://community.hivemq.com/u/Daria_H)
#### Post date: [August 24, 2022, 12:21pm UTC](https://community.hivemq.com/t/error-in-log-serialization-of-kafka-metrics/1371/2 "2022-08-24T12:21:34Z")

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@Shaku , this is a known bug, please upgrade your HiveMQ version.