diff --git a/public/index.html b/public/index.html
index 4a7197b..6ff4dc3 100644
--- a/public/index.html
+++ b/public/index.html
@@ -639,8 +639,8 @@ async function loadDashboard() {
     const maxVal = Math.max(...Object.values(severityCounts), 1);
     chartEl.innerHTML = `<div class="d-flex align-items-end gap-2" style="height:120px">${Object.entries(severityCounts).map(([sev, cnt]) => {
       const color = { critical: 'danger', warning: 'warning', info: 'info' }[sev] || 'secondary';
-      const pct = (cnt / maxVal) * 100;
-      return `<div class="d-flex flex-column align-items-center flex-fill"><div class="bg-${color}" style="width:100%;height:${pct}%;min-height:4px;border-radius:4px 4px 0 0"></div><small class="mt-1">${sev}<br><strong>${cnt}</strong></small></div>`;
+      const pct = maxVal > 0 ? (cnt / maxVal) * 100 : 0;
+      return `<div class="d-flex flex-column align-items-center flex-fill" style="height:100%"><div class="bg-${color}" style="width:100%;height:${pct}%;min-height:4px;border-radius:4px 4px 0 0"></div><small class="mt-1">${sev}<br><strong>${cnt}</strong></small></div>`;
     }).join('')}</div>`;
 
     document.getElementById('lastUpdated').textContent = 'Updated ' + new Date().toLocaleTimeString();