I'm not sure how - I was having some significant bugs (literally).
On logging in, I had multiple flying insects and swamp gas in my inventory.
I was also missing a hammer I had been using when I logged in 30 minutes previously.
On trying other characters, the same bug presented.
When trying to play, I kept encountering issues with usages saying I didn't have an item I very clearly did,
as multiple times dropping it and picking it up would eventually allow it to work.
Then I logged again, deleted the client files, and redownloaded them... Still with the error.
So I just ran over to the exporter to sell some things... And then it crashed.
So... My bad