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 ('c28793e5b34e564b99d812dffe7c724f', -1, 1713571953, 1713571953, '0d3bda93', -7, 0, 0)

Line : 187
File : sessions.php