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 ('170718238e03a9481d4da41183cac1c2', -1, 1568938002, 1568938002, '22ccb0bd', -4, 0, 0)

Line : 189
File : sessions.php