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 ('f8a0833cd1ef48c6537bb846012e56c5', -1, 1558590705, 1558590705, '36a3147b', -10, 0, 0)

Line : 187
File : sessions.php