phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c86b205f0bd7c2a577b0e1c3a6eb2513', -1, 1529638722, 1529638722, '36a7e644', 0, 0, 0)

Line : 189
File : sessions.php