You can try Deleting the LR Preferences file.
If that doesn't solve the problem uninstall and reinstall LR from the CC DTA.
If that doesn't solve the problem then more than likely you have a hardware problem.
What is crashing? LR only or is your system crashing and or shutting down and or restarting?
Thanks for the reply. I tried that already, both deleting the preferences, and uninstalling and reinstalling Lightroom, as I wrote.
It is only Lightroom that is freezing - the mouse pointer turns into the rotating wheel, and the programme won’t accept inputs anymore. The system runs just fine, and I can continue working with any other application. In the task manager, Lightroom is then listed as not responding. I can shut down Lightroom via the task manager. No other error ever occurs.
What kind of computer, Mac or Win PC?
Sounds like you are on a Mac.
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It appears you are trying to add images from a NAS into your catalog. There are several types of NAS that lead to problems such as crashes or lockups in Lightroom. I have no clue why that happens but several people have reported that here.
1) How are you importing?
Using LR to copy from memory card (SD, CF, etc) ?
(A) From a memory card placed in a card reader?
(B) From your camera via a USB cable?
(C) From a folder on your computer in which you previously (outside of LR) copied your images from your memory card? (I se you are adding not copying)
2) If (a) or (b) what happens if a different memory card is used.
2b) and if (b), what happens with a different USB cable. But why use method (B)
2c) If (c), well that is a more complex issue, That would eliminate the easy your SD card is kaput solution.
Note: all that created while a better answer was being posted.
Thank you all kindly for your help. It’s correct that the folder I’m trying to import is on my NAS. On the same Lightroom catalogue, I have about 15 000 photos in maybe 50 folders on the same NAS. It’s unclear to me why this specific one keeps crashing repeatedly.
However, I have now tried a workaround, which seems to have solved the problem: I copied the folder to a local hard disk, then imported it into Lightroom. After deleting the folder on the local disk, I pointed Lightroom to the “new” location on the NAS. This worked!
Not ideal, but at least I continue with my work.
You could try, on your next import, copying the image files to a folder on your NAS using the File Manager for the OS you are using then in LR click the Import button and then the "Add" option at the top of the import dialog and then Point it to the folder you had copied the images to. That will Add those images to the LR catalog and leave them where they are.