MariaDB crashes querying CONNECT/ODBC tables

I am trying to use MariaDB to expose data from a legacy system (Guru) in order to eventually migrate to something built with MariaDB. DELETE queries seem to always cause a crash, and some UPDATE queries do as well. A query that causes a crash seems to reliably cause crashes.

I have attached the relevant section of the error log, my configuration file, and the schema of the table involved in this query. I had a quick look at OpenDB() in tabodbc.cpp, but didn't get much past comments.