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 ('352fe36c11f0ac1e89746e9fa87f5faa', -1, 1713571191, 1713571191, '1276c856', -4, 0, 0)

Line : 187
File : sessions.php