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 ('9d2f0b74e2b77f2f7e5a8cf4355b2163', -1, 1713921790, 1713921790, '12d9dc72', -10, 0, 0)

Line : 187
File : sessions.php