[Koha] 'borrower_attribute_types' table contains references to invalid category codes

[justanothermate at gmail.com]

While updating to 22.05 we're getting the error

Upgrade to 21.12.00.041 [17:46:08]: Bug 30449 - Check
borrower_attribute_types FK constraint
ERROR: {UNKNOWN}: The 'borrower_attribute_types' table contains references
to invalid category codes: at
/usr/share/koha/intranet/cgi-bin/installer/data/mysql/db_revs/211200041.pl
line 40. at /usr/share/koha/lib/C4/Installer.pm line 739

result from borrower_attribute_types;
only 1 line with show_bcode

no other patron attributes present besides show_bcode

would appreciate any help.