LR CC keeps crashing when relaunching different catalogue. Try reopening, then crashes again. Crash seems to to refer to user library/adobe/cashes/lightroom. Thanks.
If you have recently updated it please follow the below article to solve the crash issue:
If that does not help please try the below mentioned steps:
Reset Lightroom preferences by holding the shift + option (Mac) or shift+alt (Windows) while launching Lightroom.