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 ('3a30f7953b9b14726880f3a4575d4186', -1, 1540156361, 1540156361, '36a174e1', -8, 0, 0)

Line : 193
File : sessions.php