diff --git a/opcache.php b/opcache.php
index f22ddc6..ca0d591 100644
--- a/opcache.php
+++ b/opcache.php
@@ -620,22 +620,23 @@ function set_text(t) {
         }
 
         function change() {
-            // Filter out any zero values to see if there is anything left
-            var remove_zero_values = dataset[this.value].filter(function(value) {
-                return value > 0;
-            });
-
             // Skip if the value is undefined for some reason
-            if (typeof dataset[this.value] !== 'undefined' && remove_zero_values.length > 0) {
-                $('#graph').find('> svg').show();
-                path = path.data(pie(dataset[this.value])); // update the data
-                path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs
-            // Hide the graph if we can't draw it correctly, not ideal but this works
-            } else {
-                $('#graph').find('> svg').hide();
-            }
+            if (typeof dataset[this.value] !== 'undefined') {
+                // Filter out any zero values to see if there is anything left
+                var remove_zero_values = dataset[this.value].filter(function(value) {
+                    return value > 0;
+                });
+                if (remove_zero_values.length > 0) {
+                    $('#graph').find('> svg').show();
+                    path = path.data(pie(dataset[this.value])); // update the data
+                    path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs
+                // Hide the graph if we can't draw it correctly, not ideal but this works
+                } else {
+                    $('#graph').find('> svg').hide();
+                }
 
-            set_text(this.value);
+                set_text(this.value);
+            }
         }
 
         function arcTween(a) {