diff --git a/sequence/linear_test.go b/sequence/linear_test.go
index d3c7e21..ef1243e 100644
--- a/sequence/linear_test.go
+++ b/sequence/linear_test.go
@@ -22,3 +22,7 @@ func TestValueWithStep(t *testing.T) {
 	assert.Equal(100, values[20])
 	assert.Len(values, 21)
 }
+
+func TestValuesLen(t *testing.T) {
+	assert := assert.New(t)
+}
diff --git a/sequence/sequence.go b/sequence/sequence.go
index 4565af4..5234d56 100644
--- a/sequence/sequence.go
+++ b/sequence/sequence.go
@@ -23,6 +23,11 @@ type Seq struct {
 
 // Array enumerates the sequence into a slice.
 func (s Seq) Array() (output []float64) {
+	if s.Len() == 0 {
+		return
+	}
+
+	println(s.Len())
 	output = make([]float64, s.Len())
 	for i := 0; i < s.Len(); i++ {
 		output[i] = s.GetValue(i)
@@ -236,7 +241,7 @@ func (s Seq) Percentile(percent float64) (percentile float64) {
 	return percentile
 }
 
-// Normalize maps every value to the interval [0, 1.0).
+// Normalize maps every value to the interval [0, 1.0].
 func (s Seq) Normalize() Seq {
 	min, max := s.MinMax()
 
diff --git a/sequence/sequence_test.go b/sequence/sequence_test.go
index 2b4c81b..e9927b4 100644
--- a/sequence/sequence_test.go
+++ b/sequence/sequence_test.go
@@ -90,5 +90,6 @@ func TestSequenceNormalize(t *testing.T) {
 	assert.NotEmpty(normalized)
 	assert.Len(normalized, 5)
 	assert.Equal(0, normalized[0])
+	assert.Equal(0.25, normalized[1])
 	assert.Equal(1, normalized[4])
 }