LibRaw 0.19 Crashing DigiKam6 on macOS

I have an issue with LibRaw 0.19 on macOS. I'm using DigiKam 6beta which now includes LibRaw 0.19 and this is crashing while scanning RAW (NEF) images from a Nikon D5300 12bit.
This is not happening with LibRaw 0.18.11 in an earlier build of DigiKam6beta

How can I help to track this bug down and get it fixed?

kind regards