phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a5f86753f781cf8942db7120d621b2fb' for key 'PRIMARY'

INSERT INTO phpbb_forumsessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('a5f86753f781cf8942db7120d621b2fb', -1, 1770319860, 1770319860, 'd849d89e', 0, 0, 0)

Line : 187
File : sessions.php