fsck crashes on buster

[daggs <daggs@gmx.com>]

Greetings,

my backup hdd has errors in the fs, so I've stopped the backup process and unmounted it.
when I run fsck /dev/sdc1, I get this:
root@utilsserver:/home/igor# fsck /dev/sdc1
fsck from util-linux 2.33.1
e2fsck 1.44.5 (15-Dec-2018)
backup contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Signal (11) SIGSEGV si_code=SEGV_MAPERR fault addr=0x13
fsck.ext3(+0x31a59)[0x55bc7d8afa59]
/lib/x86_64-linux-gnu/libc.so.6(+0x37840)[0x7feed55ab840]
/lib/x86_64-linux-gnu/libext2fs.so.2(ext2fs_rb_next+0x23)[0x7feed57e8b33]
/lib/x86_64-linux-gnu/libext2fs.so.2(+0x17802)[0x7feed57c1802]
/lib/x86_64-linux-gnu/libext2fs.so.2(ext2fs_icount_increment+0x158)[0x7feed57d3d48]
fsck.ext3(+0x21645)[0x55bc7d89f645]
fsck.ext3(+0x22997)[0x55bc7d8a0997]
/lib/x86_64-linux-gnu/libext2fs.so.2(ext2fs_dblist_iterate3+0x5f)[0x7feed57c72bf]
fsck.ext3(e2fsck_pass2+0x18a)[0x55bc7d89d9ba]
fsck.ext3(e2fsck_run+0x5a)[0x55bc7d89166a]
fsck.ext3(main+0xcce)[0x55bc7d88d2be]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7feed559809b]
fsck.ext3(_start+0x2a)[0x55bc7d88f58a]

the os is updated to latest. any hints on how to fix it?
I'd rather not turn it off to extract the hdd as it is a production server.

Thanks,

Dagg.