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) VALUES ('a7f4cca87d3e5c6b8f13ef495f1cb45d', -1, 1329185551, 1329185551, '266bb3f3', 0, 0)

Line : 158
File : sessions.php