Why it is happening, its pretty easy. Maxmind discontinued old version of IP database since 2nd of January 2019. So this version of xtables-addons will be not working.
There should be available quick fix, which is converting new version to the old format called GeoLite2xtables on github: https://github.com/mschmitt/GeoLite2xtables However I found at least one error where IP was missplaced, while supposedly same database on maxmind website was returning correct value. So use with caution. I don't think, upgrading the package in this release will happen. New version of xtables-addons is using geoip database in slightly different format, which means, also kernel module has to be updated, which doesn't sound like something what anybody want to do in this release. But I might be wrong.:-)
