phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('ab46f4f485566423331dd3f27c6b498a', -1, 1542518980, 1542518980, '36a31439', 0, 0, 0)

Line : 193
File : sessions.php