phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7d73aa4be2f4e13adeb598cef075f539' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7d73aa4be2f4e13adeb598cef075f539', -1, 1493297605, 1493297605, '171432f2', 19, 0, 0)

Line : 187
File : sessions.php