phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '171711f156bb4d3cb8867c1999fe867c' 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 ('171711f156bb4d3cb8867c1999fe867c', -1, 1779158606, 1779158606, 'd849d8c0', 6, 0, 0)

Line : 187
File : sessions.php