phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '645626dd9e7926e2afff0d6672a7b808' 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 ('645626dd9e7926e2afff0d6672a7b808', -1, 1769236647, 1769236647, 'd849d814', -4, 0, 0)

Line : 187
File : sessions.php