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) VALUES ('f388a054ec9ca835d150d398c5dce5e7', -1, 1524467417, 1524467417, '36e02ca8', 1, 0)

Line : 158
File : sessions.php