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 ('aaa78f3f863b211d52999e0a5c711d65', -1, 1711717509, 1711717509, '12ce4c2d', 4, 0, 0)

Line : 187
File : sessions.php