phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO iabb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('e5abc561f9efcba269d3f6192c326c9d', -1, 1560910055, 1560910055, '36a11ff7', -2, 0, 0)

Line : 187
File : sessions.php