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 ('c5d561243b8be08a4a3b9f54befbe6b2', -1, 1711659081, 1711659081, '36c41b7a', 2, 0, 0)

Line : 187
File : sessions.php