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 ('b4d5f919cd3e9a6ce42854b521e9952e', -1, 1737600446, 1737600446, '12776e4c', -9, 0, 0)

Line : 187
File : sessions.php