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 ('771a63909ed36ec2faf1774d36d57a87', -1, 1728572916, 1728572916, '54ccfc03', -2, 0, 0)

Line : 187
File : sessions.php