phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO start_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('72013906f90d9817b09a0fabce0e757a', -1, 1419059544, 1419059544, '36ed62e5', 0, 0)

Line : 158
File : sessions.php