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 ('836aa4a38c8122d3b70933745ad51772', -1, 1711708740, 1711708740, '22c9adf4', 0, 0, 0)

Line : 187
File : sessions.php