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 ('7e34edb817a4c7cf27d50a7e31500993', -1, 1558826732, 1558826732, '03558fef', -11, 0, 0)

Line : 187
File : sessions.php