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 ('492a9327d9e44831f79e7e0a0616d889', -1, 1711707986, 1711707986, 'ae818cce', 5, 0, 0)

Line : 187
File : sessions.php