diff --git a/templates/dashboard.html b/templates/dashboard.html
index 6b587b9..7bde8ab 100644
--- a/templates/dashboard.html
+++ b/templates/dashboard.html
@@ -1167,6 +1167,14 @@
                 });
             });
             
+            // Handle empty data case
+            let minVal = 0;
+            let maxVal = 5;
+            if (allData.length > 0 && zoomedScale) {
+                minVal = Math.max(0, Math.min(...allData) - 0.5);
+                maxVal = Math.min(5, Math.max(...allData) + 0.5);
+            }
+            
             window.categoryChartInstance = new Chart(ctx, {
                 type: 'radar',
                 data: {
@@ -1196,8 +1204,8 @@
                     scales: {
                         r: {
                             beginAtZero: !zoomedScale,
-                            min: zoomedScale ? Math.max(0, Math.min(...allData) - 0.5) : 0,
-                            max: zoomedScale ? Math.min(5, Math.max(...allData) + 0.5) : 5,
+                            min: zoomedScale ? minVal : 0,
+                            max: zoomedScale ? maxVal : 5,
                             ticks: {
                                 stepSize: zoomedScale ? 0.5 : 1,
                                 backdropColor: 'transparent'