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 ('1506341548e21d5a9733451ee684f0d0', -1, 1542136253, 1542136253, '36ea0daf', 8, 0, 0)

Line : 187
File : sessions.php