Roon tries to add not existing tracks

I have a strange problem:
After rebuilding Roon Rock (I killed my NUC-SSD) Roon has imported all my 3808 albums with 73.000 tracks.
But when I click on the still spinning icon roon indicates that it has to import 81.000 tracks.
However: the difference between 73.000 and 81.000 does not exist! Every album is complete. I do not have more than 73.000 tracks.
Roon is trying to import tracks which are not existing. There ist no progress in the searching process. The count has stopped at 73.000 which is correct.
What to do?


After restarting the core the problem is solved.