diff --git a/http/good_temp.go b/http/good_temp.go
index 1fde50a..c3f6b2d 100644
--- a/http/good_temp.go
+++ b/http/good_temp.go
@@ -21,6 +21,9 @@ func tempPercent(value, max int) int {
 
 // Function to calculate a partial radius, depending on a percentage value
 func tempProcessRadius(value, max, radius int) float64 {
+	if value >= max {
+		return 0
+	}
 	return (1 - float64(value)/float64(max)) * float64(radius) * 2 * 3.14
 }
 
diff --git a/http/good_temp_test.go b/http/good_temp_test.go
index 0484c90..afd411f 100644
--- a/http/good_temp_test.go
+++ b/http/good_temp_test.go
@@ -16,4 +16,7 @@ func TestTempFuncs(t *testing.T) {
 	// TODO is there a other way to calc this?
 	resultFloat := tempProcessRadius(3, 9, 0)
 	assert.Equal(float64(0), resultFloat)
+
+	resultFloat = tempProcessRadius(12, 9, 10)
+	assert.Equal(float64(0), resultFloat)
 }