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 ('c8b4911729c65f59f0983b2aa53022c7', -1, 1560760477, 1560760477, '22e57e1d', -2, 0, 0)

Line : 191
File : sessions.php