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, session_admin) VALUES ('da184f27f0f3c156bae4d20bd083d2dc', -1, 1506383774, 1506383774, '369c45cc', -1, 0, 0)

Line : 187
File : sessions.php