phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c51bb11e9c91edb86ba580192646d11c' 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 ('c51bb11e9c91edb86ba580192646d11c', -1, 1768147349, 1768147349, '0aff0001', 71, 0, 0)

Line : 199
File : sessions.php