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) VALUES ('a9d87329ccd7f56ef189d379fff1f7b7', -1, 1539618131, 1539618131, '36a285de', 0, 0)

Line : 158
File : /Forums/includes/sessions.php