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 ('af8fdad1844f0a84eba85ab3a6b62fe1', -1, 1500942574, 1500942574, '3651d22a', 0, 0, 0)

Line : 189
File : sessions.php