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 ('b9d20e4b625556a1b599db1f08da0377', -1, 1711646981, 1711646981, '36e27e26', 0, 0, 0)

Line : 187
File : sessions.php