phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '78955d3c2237b2882a957687ae5e7d54' 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 ('78955d3c2237b2882a957687ae5e7d54', -1, 1784352707, 1784352707, 'd849d82b', -9, 0, 0)

Line : 187
File : sessions.php