diff --git a/packages/playground/src/weblets/tf_contracts_list.vue b/packages/playground/src/weblets/tf_contracts_list.vue
index 5d627a82fc..e2e2849d62 100644
--- a/packages/playground/src/weblets/tf_contracts_list.vue
+++ b/packages/playground/src/weblets/tf_contracts_list.vue
@@ -27,7 +27,7 @@
         <input-tooltip
           inline
           :alignCenter="true"
-          :tooltip="`${totalCostUSD} USD/hour ≈ ${totalCostUSD === 0 ? 0 : (totalCostUSD! * 24 * 30).toFixed(3)} USD/month`"
+          :tooltip="`${totalCostUSD?.toFixed(3)} USD/hour ≈ ${totalCostUSD === 0 ? 0 : (totalCostUSD! * 24 * 30).toFixed(3)} USD/month`"
         >
           {{ totalCost }} TFT/hour ≈ {{ totalCost === 0 ? 0 : (totalCost * 24 * 30).toFixed(3) }} TFT/month
         </input-tooltip>