[Koha] Problem upgrade koha-3.8.0 to koha-3.08.04

[Vikas Salunkhe]

Dear all
i try to upgrade koha-3.8.0 to  koha-3.08.04 when i upgrade  and use
command following error is comming

1)  misc/maintenance/remove_items_from_biblioitems.pl --run

error -  Use of uninitialized value in pattern match (m//) at
/usr/share/koha/lib/C4/Biblio.pm line 2926.

2) misc/migration_tools/rebuild_zebra.pl -b -r

error -  19:29:23-30/08 zebraidx(2359) [warn] Unknown register type:

Please guide how solve the problem

Regards
Vikas Salunkhe