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 ('6f55a186256efb93669dfc5856c4e98c', -1, 1730420000, 1730420000, '12e2bb37', -1280, 0, 0)

Line : 195
File : sessions.php