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 ('8119ac0535f91bcdf906446f2331fe66', -1, 1558564852, 1558564852, '6b17814d', 0, 0, 0)

Line : 189
File : sessions.php