phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a4a5c6c404d34305e423f798b670a577' 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 ('a4a5c6c404d34305e423f798b670a577', -1, 1770086773, 1770086773, 'c0a8100b', -501, 0, 0)

Line : 187
File : sessions.php