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 ('dcebed6452eb7d9b3cead1a03f770bb8', -1, 1532297776, 1532297776, '36c66fb9', 3, 0, 0)

Line : 187
File : sessions.php