phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO oka_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('ca6b9c60cdb3f1d208d636f621f58d99', -1, 1550506323, 1550506323, '22e473d8', 30, 0)

Line : 184
File : /home/c128/public_html/talk/includes/sessions.php