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 ('0ddb7e9b364f6f83b1fb1c52ce2a2d6f', -1, 1711711393, 1711711393, '36513d0e', -7, 0, 0)

Line : 187
File : sessions.php