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 ('e7f8de4385c0067f84b6bfceac02d9b7', -1, 1540158230, 1540158230, '36a174e1', 0, 0, 0)

Line : 193
File : sessions.php