diff --git a/ox/torrent/bencode3.py b/ox/torrent/bencode3.py
index eefda6f..31c4523 100644
--- a/ox/torrent/bencode3.py
+++ b/ox/torrent/bencode3.py
@@ -24,7 +24,7 @@ class Decoder(object):
         """
         start = self.data.index(b':', self.idx)
         l = int(self.data[self.idx:start].decode(), 10)
-        if l <= 0:
+        if l < 0:
             raise Exception('invalid string size: %d' % l)
         start += 1
         ret = self.data[start:start+l]
@@ -139,6 +139,8 @@ def _encode(obj, buff):
         _encode_str(obj, buff)
     elif str(obj).isdigit():
         _encode_int(obj, buff)
+    elif isinstance(obj, int):
+        _encode_int(obj, buff)
     elif isinstance(obj, list):
         _encode_list(obj, buff)
     elif hasattr(obj, 'keys') and hasattr(obj, 'values'):
@@ -146,7 +148,7 @@ def _encode(obj, buff):
     elif str(obj) in ['True', 'False']:
         _encode_int(int(obj and '1' or '0'), buff)
     else:
-        raise Exception('non serializable object: %s' % obj)
+        raise Exception('non serializable object: %s [%s]' % (obj, type(obj)))
 
 
 def bencode(obj):