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 ('2eb5c929e4b60d5f8f78d22bc273e4fd', -1, 1327777580, 1327777580, '266bb3d3', 0, 0, 0)

Line : 189
File : sessions.php