To recreate: 1) Go to staff client 2) Go to Patrons module 3) Click 'New patron' and choose "Kid" 4) Add a guarantor 5) Add the child's name and other details etc - make sure you set their card number as something you already know exists 6) Save the patron and confirm there is an error message popping up about the card number already existing 7) Notice that the guarantor is no longer attached and you would have to add it again - We want the guarantor to still be linked even if an error arises.
This seems to be a duplicate of bug 26558.
*** This bug has been marked as a duplicate of bug 26558 ***
(In reply to Emmi Takkinen from comment #1) > This seems to be a duplicate of bug 26558. Sorry didn't see that! Thanks so much!