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 ('7cf5a4b9ff30a2dbceca3ddd7a896b2e', -1, 1544797352, 1544797352, '36e2243c', 0, 0, 0)

Line : 172
File : sessions.php