diff --git a/client/src/components/ControlPanel.jsx b/client/src/components/ControlPanel.jsx
index 9745799..30c8327 100644
--- a/client/src/components/ControlPanel.jsx
+++ b/client/src/components/ControlPanel.jsx
@@ -5,7 +5,9 @@ import './ControlPanel.css';
 function TurtleCard({ turtle, isSelected, onSelect }) {
   const activeState = turtle.state || turtle.mode || 'idle';
   const fuel = turtle.fuel === 'unlimited' ? '∞' : (turtle.fuel || '?');
-  const inventoryCount = turtle.inventory?.length || 0;
+  const inventoryCount = Array.isArray(turtle.inventory) 
+    ? turtle.inventory.length 
+    : (turtle.inventory ? Object.keys(turtle.inventory).length : 0);
   const displayName = turtle.label || `Turtle ${turtle.turtleID}`;
 
   const modeColors = {