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 ('91fe1367c7f57e8141893d2c7fa7c8e4', -1, 1713951809, 1713951809, '030f9c8c', -8, 0, 0)

Line : 187
File : sessions.php