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 ('c1d4206e045d93ba74e7ebaa4bfbb47c', -1, 1728639665, 1728639665, '03ec56b8', -7, 0, 0)

Line : 187
File : sessions.php