Many PSP discs Diego added in October 2018 have bad ringcodes, most already have a comment on them, but these don't:
Comments: Ringcode needs to be checked.
[PSP] Crash Tag Team Racing (Spain) (2nd layer is for [PSP] Buzz! The Ultimate Music Quiz (Europe) (Es,Pt))
[PSP] Nickelodeon Bob Esponja - Atrapados en el Congelador (Spain) (Mastering code is one digit too short)