diff --git a/components/ExperimentDetail.tsx b/components/ExperimentDetail.tsx
index 00c2f61..4aed142 100644
--- a/components/ExperimentDetail.tsx
+++ b/components/ExperimentDetail.tsx
@@ -67,7 +67,7 @@ const ExperimentDetail: React.FC<ExperimentDetailProps> = ({ experimentId, onClo
   const chartData = useMemo(() => {
     if (!experiment || !salesData.length) return [];
 
-    const asinSet = new Set(experiment.asins.map(a => a.toUpperCase()));
+    const asinSet = new Set((experiment.asins || []).map(a => a.toUpperCase()));
     const weeklyMap = new Map<string, any>();
 
     salesData.forEach(r => {
diff --git a/components/ExperimentsView.tsx b/components/ExperimentsView.tsx
index cdea87f..2e67193 100644
--- a/components/ExperimentsView.tsx
+++ b/components/ExperimentsView.tsx
@@ -17,9 +17,9 @@ const getChartMetricColor = (metric: string) => {
 
 const ExperimentSparkline: React.FC<{ experiment: ExperimentListItem; salesData: CombinedKPIs[] }> = ({ experiment, salesData }) => {
   const chartData = useMemo(() => {
-    if (!experiment.asins || !salesData.length) return [];
+    if (!experiment?.asins || !salesData?.length) return [];
 
-    const asinSet = new Set(experiment.asins.map(a => a.toUpperCase()));
+    const asinSet = new Set((experiment.asins || []).map(a => (a || '').toUpperCase()));
     const weeklyMap = new Map<string, any>();
 
     salesData.forEach(r => {