phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '20d461a258446ef618670962b5c0c8c4' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('20d461a258446ef618670962b5c0c8c4', -1, 1768332018, 1768332018, 'd849d81c', -4, 0, 0)

Line : 187
File : sessions.php