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 ('4c33e2ae0fa6a38a8057746c9e1a93f1', -1, 1728712928, 1728712928, '22ef96a7', -2, 0, 0)

Line : 187
File : sessions.php