That could just be a corrupted database file.

The KStars data is located in ~/Library/Application Support/kstars
The KStars preferences rc file is located in ~/Library/Preferences/kstarsrc

A good way to try to fix it would be to rename one or both of these as a backup and then run KStars and when it regenerates the files, see if it fixes the problem. If it does, you can try to copy back any info from your backup file(s) and if not, you can delete the new files and restore the backup.

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