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 ('f958ca7a19572becfc74ed1a9f81899c', -1, 1711640148, 1711640148, '12eaa56b', 2, 0, 0)

Line : 187
File : sessions.php