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 ('29e534b7ca0bd8bd08bbb9d1e7227879', -1, 1493206727, 1493206727, '36e113ff', 1, 0)

Line : 158
File : sessions.php