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 ('d0dca42c290eef81c38268b1ef30d157', -1, 1429951441, 1429951441, 'ae814021', 0, 0)

Line : 158
File : sessions.php