diff --git a/src/webdrop_bridge/ui/main_window.py b/src/webdrop_bridge/ui/main_window.py
index b4ac0b0..fbfc1b3 100644
--- a/src/webdrop_bridge/ui/main_window.py
+++ b/src/webdrop_bridge/ui/main_window.py
@@ -626,9 +626,9 @@ class MainWindow(QMainWindow):
                     const data = await response.json();
                     console.log('[Checkout Check] Full data:', JSON.stringify(data));
                     console.log('[Checkout Check] Checkout field:', data.checkout);
-                    const hasCheckout = data.checkout && Object.keys(data.checkout).length > 0;
+                    const hasCheckout = !!(data.checkout && Object.keys(data.checkout).length > 0);
                     console.log('[Checkout Check] Has checkout:', hasCheckout);
-                    window['{callback_id}'] = JSON.stringify({{ checkout: data.checkout, hasCheckout: hasCheckout }});
+                    window['{callback_id}'] = JSON.stringify({{ checkout: data.checkout || null, hasCheckout: hasCheckout }});
                 }} else {{
                     console.log('[Checkout Check] Failed to fetch, status:', response.status);
                     window['{callback_id}'] = JSON.stringify({{ error: 'Failed to fetch asset', status: response.status }});