How to handle errors from transformations in items?

Dear all,

I have defined an item which is configured to use JSON-Transformation from a cached HTTP-Request.
It does work fine, except in the case of a reply with the missing JSON-Path.That happens frequently (i.e. Wundergrund).

If the cached request returns no error, but the JSON does not contain the JSON Parameter, the item-transformation keeps going permanently retrying the request, causing flooded log-files and CPU-Stress.

Any suggestions?