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 ('0c31c3d33f0c4ac7abb82100bfe5dc1d', -1, 1770294640, 1770294640, '54ccfc03', 2, 0, 0)

Line : 187
File : sessions.php