phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '81f7dcf15423e464bb31fce0b242b347' 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 ('81f7dcf15423e464bb31fce0b242b347', -1, 1770558515, 1770558515, 'c0a8100b', -9, 0, 0)

Line : 187
File : sessions.php