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 ('d0017d830bd97c3f8e99d2434b29b929', -1, 1490399560, 1490399560, '32106160', -4, 0, 0)

Line : 187
File : sessions.php