Cancel button in "Map Count" crashes Z-Quest (build 200)

Clicking the Cancel button in Maps > Map Count crashes Z-Quest, as does clicking the Close ('X'😉 button and/or pressing Escape.

It also generates .TMP files in the ZC folder with file size 1.23 MB - I renamed one of them to 1.EXE and ran it through CMD, and I got this:

Program too big to fit in memory

Any ideas?