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 ('48b8caf5808695d069e0c7772739ab26', -1, 1490399618, 1490399618, '32106160', 12, 0, 0)

Line : 187
File : sessions.php