Yes, you are correct. Upgrading did fix the issue. However, I can't figure out how to use the whitelist feature via the GUI. I know that in the config file for nginx, "basic rule wl:11;" would whitelist rule 11. How do I do that via the GUI? I've tried creating a separate policy and attaching a basic rule with id 11 selecting a URL value, but nginx throws an error in the log:
2019/03/11 20:42:09 [emerg] 18627#100242: matchzone doesn't target an actual zone. in /usr/local/etc/nginx/nginx.conf:301
2019/03/11 20:42:09 [emerg] 18627#100242: Naxsi-Config : Incorrect line BasicRule id:11 (/usr/obj/usr/ports/www/nginx/work/naxsi-0.56/naxsi_src/naxsi_skeleton.c/474)... in /usr/local/etc/nginx/nginx.conf:301
2019/03/11 20:42:09 [emerg] 18627#100242: matchzone doesn't target an actual zone. in /usr/local/etc/nginx/nginx.conf:301
2019/03/11 20:42:09 [emerg] 18627#100242: Naxsi-Config : Incorrect line BasicRule id:11 (/usr/obj/usr/ports/www/nginx/work/naxsi-0.56/naxsi_src/naxsi_skeleton.c/474)... in /usr/local/etc/nginx/nginx.conf:301