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 ('7b9b3b2b1b98c56feb6456692f774900', -1, 1728718253, 1728718253, '22ef96a7', -4, 0, 0)

Line : 187
File : sessions.php