phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO zagataphpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6322ffb01c40a86a48df1cce08a6314e', -1, 1502990465, 1502990465, '36501e31', 1, 0, 0)

Line : 187
File : sessions.php