I am having same issue (LrC error) when I check roll analysis, crashes typically 3-6 images in, get the LrC error report, go back in and it shows some converted. I usually hit cancel and start again. Started about a month ago and thought it was after I did the latest LrC update. Seems to work if I do each image individually. LrC 13.5.1 & MacOS 15.0.1