External User Groups are not functioning, searching user returns NULL

Issue

• Auto-create account and usergroup sync are enabled, the debug logs show the groups being found but not updated.

• Log file,

2016-01-20 11:50:05 [D] Refreshing external user group example_group
2016-01-20 11:50:05 [D]   AuthSource Load (0.3ms)  SELECT "auth_sources".* FROM "auth_sources" WHERE "auth_sources"."id" = 3 LIMIT 1
2016-01-20 11:50:05 [D]   Usergroup Load (0.3ms)  SELECT "usergroups".* FROM "usergroups" WHERE "usergroups"."id" = 2 ORDER BY 

 LIMIT 1
2016-01-20 11:50:05 [D]   User Load (0.5ms)  SELECT "users".* FROM "users" INNER JOIN "usergroup_members" ON "users"."id" = "usergroup_members"."member_id" WHERE "usergroup_members"."usergroup_id" = 2 AND "usergroup_members"."member_type" = 'User' ORDER BY firstname
2016-01-20 11:50:05 [D]   ExternalUsergroup Load (0.2ms)  SELECT "external_usergroups".* FROM "external_usergroups" WHERE "external_usergroups"."usergroup_id" = 2
2016-01-20 11:50:05 [D]   CACHE (0.0ms)  SELECT "auth_sources".* FROM "auth_sources" WHERE "auth_sources"."id" = 3 LIMIT 1
2016-01-20 11:50:05 [D]   User Load (0.6ms)  SELECT "users".* FROM "users" WHERE "users"."lower_login" IN (NULL) ORDER BY firstname
2016-01-20 11:50:05 [D]    (0.1ms)  BEGIN
2016-01-20 11:50:05 [D]    (0.1ms)  COMMIT
2016-01-20 11:50:05 [D]   CACHE (0.0ms)  SELECT "users".* FROM "users" WHERE "users"."lower_login" IN (NULL) ORDER BY firstname
2016-01-20 11:50:05 [D]    (0.1ms)  BEGIN
2016-01-20 11:50:05 [D]    (0.1ms)  COMMIT