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 ('96c79b8201079b3bf53218f793db4716', -1, 1711706820, 1711706820, '2ccc6305', -8, 0, 0)

Line : 187
File : sessions.php