You are trying to persist a collection of ivy-core user objects. And these are long recursive trees. Which even lead to a stack overflow if you try to serialize them.
However, normally this happens by an accident when designing your Data. And I'd simply remove that object from the object tree before serializing. I didn't test it but think that either by removing 'persist' flags on the DataClass or if you are persisting a normal java object, just mark the field and it's getters with @JsonIgnore. `@JsonIgnore`. See https://dev.axonivy.com/doc/8.0/designer-guide/data-modeling/business-data.html#field-without-get-setter