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) VALUES ('82f95ceb3957a8e688c7e2fe3d5e26d0', -1, 1566592752, 1566592752, '12ce0d27', -4, 0)

Line : 158
File : sessions.php