phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '18786380d9d750ab21c7cde63304cbef' 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 ('18786380d9d750ab21c7cde63304cbef', -1, 1784307357, 1784307357, 'd849d8f9', 11, 0, 0)

Line : 187
File : sessions.php