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 ('896f85b4adf1cfc68a0b70f4b45a0b09', -1, 1728710928, 1728710928, '54ccfc03', -4, 0, 0)

Line : 187
File : sessions.php