phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f6f4a68a5b69a398b2ab1aa299902660' 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 ('f6f4a68a5b69a398b2ab1aa299902660', -1, 1537845650, 1537845650, '36e13b0e', -11, 0, 0)

Line : 187
File : sessions.php