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 ('c7b51d135bd917d3c2522f524bf815f9', -1, 1550968827, 1550968827, '00000000', 0, 0, 0)

Line : 172
File : sessions.php