phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '855cf475ccab911a18b1290e3092839c' 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 ('855cf475ccab911a18b1290e3092839c', -1, 1772237571, 1772237571, '00000000', -9, 0, 0)

Line : 187
File : sessions.php