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 ('695801c919a4e0d4a9cc4ce080d3e21f', -1, 1329139916, 1329139916, '266bb3f0', -2, 0, 0)

Line : 189
File : sessions.php