phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f67a5c5e52bf49dbf8a4ffda2de5c942', -1, 1534325798, 1534325798, '36e0dc48', 0, 0, 0)

Line : 172
File : sessions.php