diff --git a/deluge/core/torrent.py b/deluge/core/torrent.py
index 10d5b4776..f40b58834 100644
--- a/deluge/core/torrent.py
+++ b/deluge/core/torrent.py
@@ -810,7 +810,11 @@ class Torrent(object):
             if peer.flags & peer.connecting or peer.flags & peer.handshake:
                 continue
 
-            client = decode_bytes(peer.client)
+            try:
+                client = decode_bytes(peer.client)
+            except UnicodeDecodeError:
+                # libtorrent on Py3 can raise UnicodeDecodeError for peer_info.client
+                client = 'unknown'
 
             try:
                 country = component.get('Core').geoip_instance.country_code_by_addr(