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 ('7b7d18b2515b0157a3adaa8c4f4182e3', -1, 1490399472, 1490399472, '32106160', 5, 0, 0)

Line : 187
File : sessions.php