phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5ffba7b69cb7709226a702900a50c3b5' 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 ('5ffba7b69cb7709226a702900a50c3b5', -1, 1764611916, 1764611916, 'd849d825', -4, 0, 0)

Line : 187
File : sessions.php