phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d3718ed6f738a3a32e323ca0f2a7cebf', -1, 1711678916, 1711678916, '36c41b7a', 2, 0, 0)

Line : 187
File : sessions.php