http://isfdb.org/cgi-bin/directory.cgi?author
If you click any link in the table on the Author Directory page (I only sampled about 6, but I assume it applies to all), you get an error message about an invalid use of AND and OR.
(L. J. Kendall)
Anonymous
My contact: luke dot kendall at gmail dot com
Fixed in biblio/directory.py, installed in SVN 381 on 2019-04-13. Closing the bug. Thanks for the heads-up!