phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '878fe550bfba91151c22ff1f0abc56dd' 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 ('878fe550bfba91151c22ff1f0abc56dd', -1, 1756539984, 1756539984, 'c0a81014', -9, 0, 0)

Line : 187
File : sessions.php