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 ('734a17a25889f4d1d30f57c2e9712d8e', -1, 1714617879, 1714617879, '12bf2c17', -55, 0, 0)

Line : 187
File : sessions.php