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 ('0efea1344e5591d3ea2a7049a6a6b698', -1, 1730415358, 1730415358, '0389a756', -9, 0, 0)

Line : 195
File : sessions.php