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 ('922f08816ee12e6e16ca94dd3946a974', -1, 1416536723, 1416536723, '36a66065', -1, 0, 0)

Line : 187
File : sessions.php