Can custom CSS cause an error when trying to upgrade?

Thanks David, I’ve started to rebuild but I think I’m getting an image without your latest fix, because I’m seeing this: 20190217

git pull
[…]
./launcher rebuild app 1.372s

WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed

Please be patient

Unable to find image 'discourse/base:2.0.20190217' locally
2.0.20190217: Pulling from discourse/base

How should I proceed? Thanks!