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 ('34093b3b914e68556e3a3db2c96421f5', -1, 1711724804, 1711724804, '36c4342d', -4, 0, 0)

Line : 187
File : sessions.php