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 ('1b60c0a2bc62993f2986668e7538eb5a', -1, 1634920661, 1634920661, '23acd9ae', 31, 0, 0)

Line : 187
File : sessions.php