Fix web client crash

mosfet.py

@@ -50,9 +50,27 @@ g.food = 20
 g.sand_origin = None
 g.reload_lock = threading.RLock()
 
+def _api_json_default(value):
+    """Serialize live protocol objects without invoking fragile __repr__ code."""
+    from minecraft.networking.packets import Packet
+
+    if isinstance(value, Packet):
+        fields = {key: item for key, item in vars(value).items()
+                  if key != 'context'}
+        return {'__type__': type(value).__name__,
+                'packet_name': getattr(value, 'packet_name', None),
+                'fields': fields}
+    if isinstance(value, (bytes, bytearray)):
+        return value.hex()
+    try:
+        return str(value)
+    except Exception:
+        return object.__repr__(value)
+
+
 @app.route('/api/global')
 def api_global():
-    data = json.dumps(g, default=lambda o: str(o), indent=4)
+    data = json.dumps(g, default=_api_json_default, indent=4)
 
     response = app.response_class(
         response=data,