phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '20e151f3a16458656ce32bb0bdcbc61a' 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 ('20e151f3a16458656ce32bb0bdcbc61a', -1, 1769516802, 1769516802, 'd849d814', -4, 0, 0)

Line : 187
File : sessions.php