diff --git a/web/pages/components/chart.tsx b/web/pages/components/chart.tsx
index 6f4c1ce39..735a6bd02 100644
--- a/web/pages/components/chart.tsx
+++ b/web/pages/components/chart.tsx
@@ -41,7 +41,7 @@ export default function Chart({ data, color, unit, dataCollections }: ChartProps
   };
 
   if (dataCollections) {
-    var ticks = dataCollections?[0].data.map(function (collection) {
+    var ticks = dataCollections[0].data?.map(function (collection) {
       return collection?.time;
     })
   } else {