Social Login extension error

[SpIdErPiGgY1984]

``When you have phpBB Social Login extension installed, and go to "Users without groups" in STK, you get this error:

[phpBB Debug] PHP Notice: in file [ROOT]/includes/functions.php on line 1169:
[phpBB Debug] PHP Notice: in file [ROOT]/stk/includes/functions.php on line 1169: Undefined index: G_OA_SOCIAL_LOGIN_REGISTER

FILE: [ROOT]/stk/includes/functions.php
LINE: 1169
CALL: stk_msg_handler()

FILE: [ROOT]/stk/tools/usergroup/users_nogroups.php
LINE: 57
CALL: get_groups()

FILE: [ROOT]/stk/index.php
LINE: 302
CALL: users_nogroups->display_options()

Social Login: https://docs.oneall.com/plugins/guide/social-login-phpbb/3.1/