Bug#988086: Exim delivery process crashes on each mail with NULL-pointer

[halfdog]

This is weird: I have only bullseye/bullseye-updates/bullseye-security
in my sources list. I applied all updates on 2nd of May with
no Exim package available. Then after the 21nails disclosure
I run the updates (timestamps in UTC):

2021-05-02 07:05:31 status installed initramfs-tools:all 0.140
...
2021-05-04 16:49:48 upgrade exim4-daemon-light:amd64 4.94-17 4.94-19

But there is no transaction for 4.94-19 in PTS between these
two dates, next is

[2021-05-05] exim4 4.94-19 MIGRATED to testing (Debian testing watch)