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 ('78c3a8b90c5e1c5d3db6a7eb315f8be7', -1, 1713491659, 1713491659, '12778f04', -4, 0, 0)

Line : 187
File : sessions.php