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 ('0bdedfe00f8f04579b43a46594284796', -1, 1513066861, 1513066861, '365bab89', 0, 0)

Line : 158
File : /Forums/includes/sessions.php