diff --git a/_examples/request_timings/main.go b/_examples/request_timings/main.go
index bcaf968..aed7493 100644
--- a/_examples/request_timings/main.go
+++ b/_examples/request_timings/main.go
@@ -23,7 +23,7 @@ func parseFloat64(str string) float64 {
 func readData() ([]time.Time, []float64) {
 	var xvalues []time.Time
 	var yvalues []float64
-	chart.File.ReadByLines("requests.csv", func(line string) {
+	err := chart.File.ReadByLines("requests.csv", func(line string) {
 		parts := strings.Split(line, ",")
 		year := parseInt(parts[0])
 		month := parseInt(parts[1])
@@ -33,6 +33,9 @@ func readData() ([]time.Time, []float64) {
 		xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
 		yvalues = append(yvalues, elapsedMillis)
 	})
+	if err != nil {
+		fmt.Println(err.Error())
+	}
 	return xvalues, yvalues
 }
 
diff --git a/_examples/scatter/main.go b/_examples/scatter/main.go
index 6e94e6d..b7d15af 100644
--- a/_examples/scatter/main.go
+++ b/_examples/scatter/main.go
@@ -5,7 +5,6 @@ import (
 	"net/http"
 
 	"github.com/wcharczuk/go-chart"
-	"github.com/wcharczuk/go-chart/drawing"
 )
 
 func drawChart(res http.ResponseWriter, req *http.Request) {
@@ -17,7 +16,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 					Show:        true,
 					StrokeWidth: chart.Disabled,
 					DotWidth:    3,
-					DotColor:    drawing.ColorRed,
 				},
 				XValues: chart.Sequence.Random(32, 1024),
 				YValues: chart.Sequence.Random(32, 1024),
diff --git a/chart.go b/chart.go
index da11756..47597ed 100644
--- a/chart.go
+++ b/chart.go
@@ -513,6 +513,7 @@ func (c Chart) styleDefaultsCanvas() Style {
 func (c Chart) styleDefaultsSeries(seriesIndex int) Style {
 	strokeColor := GetDefaultColor(seriesIndex)
 	return Style{
+		DotColor:    strokeColor,
 		StrokeColor: strokeColor,
 		StrokeWidth: DefaultSeriesLineWidth,
 		Font:        c.GetFont(),
diff --git a/draw.go b/draw.go
index be24733..6b8e3f7 100644
--- a/draw.go
+++ b/draw.go
@@ -52,6 +52,7 @@ func (d draw) LineSeries(r Renderer, canvasBox Box, xrange, yrange Range, style
 			y = cb - yrange.Translate(vy)
 			r.LineTo(x, y)
 		}
+		r.Stroke()
 	}
 
 	if style.ShouldDrawDot() {
diff --git a/linear_regression_series.go b/linear_regression_series.go
index bcd045b..142ea55 100644
--- a/linear_regression_series.go
+++ b/linear_regression_series.go
@@ -49,7 +49,9 @@ func (lrs LinearRegressionSeries) GetWindow() int {
 
 // GetEndIndex returns the effective window end.
 func (lrs LinearRegressionSeries) GetEndIndex() int {
-	return Math.MinInt(lrs.GetOffset()+(lrs.Len()), (lrs.InnerSeries.Len() - 1))
+	offset := lrs.GetOffset() + lrs.Len()
+	innerSeriesLastIndex := lrs.InnerSeries.Len() - 1
+	return Math.MinInt(offset, innerSeriesLastIndex)
 }
 
 // GetOffset returns the data offset.
@@ -62,7 +64,7 @@ func (lrs LinearRegressionSeries) GetOffset() int {
 
 // GetValue gets a value at a given index.
 func (lrs *LinearRegressionSeries) GetValue(index int) (x, y float64) {
-	if lrs.InnerSeries == nil {
+	if lrs.InnerSeries == nil || lrs.InnerSeries.Len() == 0 {
 		return
 	}
 	if lrs.m == 0 && lrs.b == 0 {
@@ -78,7 +80,7 @@ func (lrs *LinearRegressionSeries) GetValue(index int) (x, y float64) {
 // GetLastValue computes the last moving average value but walking back window size samples,
 // and recomputing the last moving average chunk.
 func (lrs *LinearRegressionSeries) GetLastValue() (x, y float64) {
-	if lrs.InnerSeries == nil {
+	if lrs.InnerSeries == nil || lrs.InnerSeries.Len() == 0 {
 		return
 	}
 	if lrs.m == 0 && lrs.b == 0 {
diff --git a/sma_series.go b/sma_series.go
index d9f7f13..f68c60d 100644
--- a/sma_series.go
+++ b/sma_series.go
@@ -50,7 +50,7 @@ func (sma SMASeries) GetPeriod(defaults ...int) int {
 
 // GetValue gets a value at a given index.
 func (sma SMASeries) GetValue(index int) (x, y float64) {
-	if sma.InnerSeries == nil {
+	if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
 		return
 	}
 	px, _ := sma.InnerSeries.GetValue(index)
@@ -62,7 +62,7 @@ func (sma SMASeries) GetValue(index int) (x, y float64) {
 // GetLastValue computes the last moving average value but walking back window size samples,
 // and recomputing the last moving average chunk.
 func (sma SMASeries) GetLastValue() (x, y float64) {
-	if sma.InnerSeries == nil {
+	if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
 		return
 	}
 	seriesLen := sma.InnerSeries.Len()