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 ('ab0cc0e49735787f13b1b3a1084ffc15', -1, 1711715952, 1711715952, '035fe7d4', -10, 0, 0)

Line : 187
File : sessions.php