phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'aa4ec11d63baf913bb24c7c1839842df' 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 ('aa4ec11d63baf913bb24c7c1839842df', -1, 1770402379, 1770402379, 'd849d8a9', 2, 0, 0)

Line : 187
File : sessions.php