diff --git a/src/components/analytics/mini-heatmap.tsx b/src/components/analytics/mini-heatmap.tsx
index 4a8405d..3731860 100644
--- a/src/components/analytics/mini-heatmap.tsx
+++ b/src/components/analytics/mini-heatmap.tsx
@@ -21,7 +21,7 @@ export function MiniHeatmap() {
     setNumbers(generated)
   }, [])
 
-  const maxFreq = numbers.length > 0 ? Math.max(...numbers.map(n => n.frequency)) : 0
+  const maxFreq = numbers.reduce((max, n) => Math.max(max, n.frequency), 0)
 
   const getColor = (freq: number) => {
     if (maxFreq === 0) return "bg-primary/10"