I looked and found other people were having this problem and posted on here around October of last year. My issue is similar but a little different.
I added my custom SQL and got it to working fine. Unfortunately we had to restart our server, and after restart I am getting a blank page. I'm not using the rokinjectmodule which seemed to cause the issue last time. I'm also not sure why it was working at first but suddenly stopped working.
Any help would be greatly appreciated.
Additional info:
the problem is happening on both v1.3.6 and the latest: 1.3.9, also removing the custom code causes the list to work (with all users showing up). Adding it back in breaks it again.
Thanks!