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 ('5bcb1d8f0d61101448980d5318d5c6ab', -1, 1711714387, 1711714387, '2cc01074', -9, 0, 0)

Line : 187
File : sessions.php