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 ('86c3a86909e9cc48ff2f823ce4e89823', -1, 1713959512, 1713959512, '039177c7', 0, 0, 0)

Line : 187
File : sessions.php