When I check an item out, hold it, check it, I get "The method Koha::Patron->0 is not covered by tests!"

Trace begun at /home/koha/src/Koha/Object.pm line 412
Koha::Object::AUTOLOAD('Koha::Patron=HASH(0x7926108)') called at /home/koha/src/Koha/Patron.pm line 1064
Koha::Patron::notice_email_address('Koha::Patron=HASH(0x7926108)') called at /home/koha/src/C4/Reserves.pm line 1633
C4::Reserves::_koha_notify_reserve(1426) called at /home/koha/src/C4/Reserves.pm line 1055
C4::Reserves::ModReserveAffect(1349, 7820, undef, 1426) called at /home/koha/src/circ/returns.pl line 167