diff --git a/components/ExperimentDetail.tsx b/components/ExperimentDetail.tsx
index c7f3d94..203ee56 100644
--- a/components/ExperimentDetail.tsx
+++ b/components/ExperimentDetail.tsx
@@ -72,7 +72,8 @@ const ExperimentDetail: React.FC<ExperimentDetailProps> = ({ experimentId, onClo
   const productBreakdown = useMemo(() => {
     if (!experiment || targetAsins.length <= 1 || !salesData.length) return null;
 
-    const parseDate = (d: string) => {
+    const parseDate = (d?: string) => {
+      if (!d) return new Date();
       const [y, m, da] = d.split('T')[0].split('-');
       return new Date(Number(y), Number(m) - 1, Number(da));
     };
diff --git a/services/experiments.ts b/services/experiments.ts
index 58f4b26..67f625f 100644
--- a/services/experiments.ts
+++ b/services/experiments.ts
@@ -232,7 +232,8 @@ export const calculateExperimentPerformance = async (
   experiment_acos: number;
   actual_lift_percent: number;
 }> => {
-  const parseLocalDate = (dateStr: string) => {
+  const parseLocalDate = (dateStr?: string) => {
+    if (!dateStr) return new Date();
     const [y, m, d] = dateStr.split('T')[0].split('-');
     return new Date(Number(y), Number(m) - 1, Number(d));
   };