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 ('546fabf4c62e3600226800ab98c3c48c', -1, 1711721209, 1711721209, '2cde5726', 0, 0, 0)

Line : 187
File : sessions.php