phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '21bdf94c93510d25840d2dc86c50130b' 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 ('21bdf94c93510d25840d2dc86c50130b', -1, 1768494004, 1768494004, '2e251811', -10, 0, 0)

Line : 187
File : sessions.php