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 ('648a4d1c4324310f23e7d76b7d688cd2', -1, 1713988746, 1713988746, '0395e62c', -4, 0, 0)

Line : 187
File : sessions.php