# 5.2.10

### What's new

* Handling PRECONDITION\_FAILED - unknown delivery tag error. When the RabbitMQ was restarted and some messages were being processed, their acknowledgment failed with the PRECONDITION\_FAILED exception, which resulted in a broken RabbitMQ connection.
* Improved sandbox around the JavaScript modifier and the `context.evalJavaScript` function.&#x20;