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 ('f373b644af8f6e2eaab2cdd40d050945', -1, 1711658402, 1711658402, '0351dd79', -4, 0, 0)

Line : 187
File : sessions.php