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 ('51e3cf4094ae935f1507cddf07a531d4', -1, 1542136223, 1542136223, '36ea0daf', 7, 0, 0)

Line : 187
File : sessions.php