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 ('7dd9c4055543d2aa70ac20597ab56851', -1, 1496128188, 1496128188, '36a7fe4e', 1, 0)

Line : 158
File : sessions.php