phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '78e79b4e9d3e295ed98c32c00e0c6391' 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 ('78e79b4e9d3e295ed98c32c00e0c6391', -1, 1778188507, 1778188507, 'd849d80f', -4, 0, 0)

Line : 187
File : sessions.php