Cannot adduser from server console

[Niko]

Steps to reproduce

1. In server console, enter command "ulx adduser niko superadmin"

Expected behavior

User is successfully added to group

Actual behavior

User is not added. Error in server console:

Error(s) in server console, if any

[ULibSync] lua/ulibsync/server/sv_users.lua:42: attempt to call method 'prepare' (a nil value)

  1. syncULibUser - lua/ulibsync/server/sv_users.lua:42

   2. fn - lua/ulibsync/server/sv_users.lua:18

    3. Call - addons/ulib/lua/ulib/shared/hook.lua:109

     4. tempfuncadd - addons/ulib/lua/ulib/server/ucl.lua:743

      5. addUser - addons/ulx/lua/ulx/xgui/server/sv_groups.lua:47

       6. call - addons/ulx/lua/ulx/modules/sh/user.lua:57

        7. __fn - addons/ulib/lua/ulib/shared/commands.lua:951

         8. execute - addons/ulib/lua/ulib/shared/commands.lua:1331

          9. unknown - addons/ulib/lua/ulib/shared/commands.lua:1359

           10. unknown - lua/includes/modules/concommand.lua:54

Error(s) in player's console, if any

None that I see

Version

ULib v2.63d (08/22/17)
ULX v3.73d (03/21/17)

[Mat]

This is an error with ulibsync, not this addon