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 ('a726c5cab8c53277e06f1cb2057c9102', -1, 1714023171, 1714023171, '038dc692', -4, 0, 0)

Line : 187
File : sessions.php