Ataccama MDC Event handler missing events?

So in an MDC project where an event handler is used to detect changes post-load and to send some ids externally via SOAP calls there’s a weird issue - Sometimes the event handler is crashing with a java.lang.IllegalStateException - All events should be associated with a record.

MDC version 12.3.

There is not enough information in your description to determine the cause of the issue. But there was a bug with a similar error message in MDC version 12.3, which was fixed in version 12.4.1