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) VALUES ('bed5bb3c153894c0422d0eee7f265512', -1, 1506035429, 1506035429, '36e103cf', 1, 0)

Line : 158
File : sessions.php