diff --git a/calc.go b/calc.go
index 25595d6..f6217a8 100644
--- a/calc.go
+++ b/calc.go
@@ -6037,7 +6037,7 @@ func getBetaHelperContFrac(fX, fA, fB float64) float64 {
 			bfinished = math.Abs(cf-cfnew) < math.Abs(cf)*fMachEps
 		}
 		cf = cfnew
-		rm += 1
+		rm++
 	}
 	return cf
 }
@@ -6914,7 +6914,7 @@ func (fn *formulaFuncs) CHIDIST(argsList *list.List) formulaArg {
 			for z <= x1 {
 				e = math.Log(z) + e
 				s += math.Exp(c*z - a - e)
-				z += 1
+				z++
 			}
 			return newNumberFormulaArg(s)
 		}
@@ -6926,7 +6926,7 @@ func (fn *formulaFuncs) CHIDIST(argsList *list.List) formulaArg {
 		for z <= x1 {
 			e = e * (a / z)
 			c = c + e
-			z += 1
+			z++
 		}
 		return newNumberFormulaArg(c*y + s)
 	}
@@ -15286,10 +15286,10 @@ func (fn *formulaFuncs) coupons(name string, arg formulaArg) formulaArg {
 		month -= coupon
 	}
 	if month > 11 {
-		year += 1
+		year++
 		month -= 12
 	} else if month < 0 {
-		year -= 1
+		year--
 		month += 12
 	}
 	day, lastDay := maturity.Day(), time.Date(year, time.Month(month), 1, 0, 0, 0, 0, time.UTC)
diff --git a/col.go b/col.go
index f51336d..c0deb58 100644
--- a/col.go
+++ b/col.go
@@ -415,6 +415,13 @@ func (f *File) SetColStyle(sheet, columns string, styleID int) error {
 	if err != nil {
 		return err
 	}
+	s := f.stylesReader()
+	s.Lock()
+	if styleID < 0 || s.CellXfs == nil || len(s.CellXfs.Xf) <= styleID {
+		s.Unlock()
+		return newInvalidStyleID(styleID)
+	}
+	s.Unlock()
 	ws, err := f.workSheetReader(sheet)
 	if err != nil {
 		return err
diff --git a/col_test.go b/col_test.go
index b7d3823..1076f31 100644
--- a/col_test.go
+++ b/col_test.go
@@ -296,6 +296,10 @@ func TestSetColStyle(t *testing.T) {
 	// Test set column style with illegal cell coordinates.
 	assert.EqualError(t, f.SetColStyle("Sheet1", "*", styleID), newInvalidColumnNameError("*").Error())
 	assert.EqualError(t, f.SetColStyle("Sheet1", "A:*", styleID), newInvalidColumnNameError("*").Error())
+	// Test set column style with invalid style ID.
+	assert.EqualError(t, f.SetColStyle("Sheet1", "B", -1), newInvalidStyleID(-1).Error())
+	// Test set column style with not exists style ID.
+	assert.EqualError(t, f.SetColStyle("Sheet1", "B", 10), newInvalidStyleID(10).Error())
 
 	assert.NoError(t, f.SetColStyle("Sheet1", "B", styleID))
 	// Test set column style with already exists column with style.
diff --git a/errors.go b/errors.go
index a31330c..48476bc 100644
--- a/errors.go
+++ b/errors.go
@@ -55,7 +55,7 @@ func newUnzipSizeLimitError(unzipSizeLimit int64) error {
 // newInvalidStyleID defined the error message on receiving the invalid style
 // ID.
 func newInvalidStyleID(styleID int) error {
-	return fmt.Errorf("invalid style ID %d, negative values are not supported", styleID)
+	return fmt.Errorf("invalid style ID %d", styleID)
 }
 
 // newFieldLengthError defined the error message on receiving the field length
diff --git a/excelize_test.go b/excelize_test.go
index 1460d4a..19aba7e 100644
--- a/excelize_test.go
+++ b/excelize_test.go
@@ -32,13 +32,22 @@ func TestOpenFile(t *testing.T) {
 	assert.EqualError(t, err, "sheet Sheet4 does not exist")
 	// Test get all the rows in a worksheet.
 	rows, err := f.GetRows("Sheet2")
-	assert.NoError(t, err)
-	for _, row := range rows {
-		for _, cell := range row {
-			t.Log(cell, "\t")
-		}
-		t.Log("\r\n")
+	expected := [][]string{
+		{"Monitor", "", "Brand", "", "inlineStr"},
+		{"> 23 Inch", "19", "HP", "200"},
+		{"20-23 Inch", "24", "DELL", "450"},
+		{"17-20 Inch", "56", "Lenove", "200"},
+		{"< 17 Inch", "21", "SONY", "510"},
+		{"", "", "Acer", "315"},
+		{"", "", "IBM", "127"},
+		{"", "", "ASUS", "89"},
+		{"", "", "Apple", "348"},
+		{"", "", "SAMSUNG", "53"},
+		{"", "", "Other", "37", "", "", "", "", ""},
 	}
+	assert.NoError(t, err)
+	assert.Equal(t, expected, rows)
+
 	assert.NoError(t, f.UpdateLinkedValue())
 
 	assert.NoError(t, f.SetCellDefault("Sheet2", "A1", strconv.FormatFloat(100.1588, 'f', -1, 32)))
@@ -396,13 +405,19 @@ func TestGetCellHyperLink(t *testing.T) {
 
 	link, target, err := f.GetCellHyperLink("Sheet1", "A22")
 	assert.NoError(t, err)
-	t.Log(link, target)
+	assert.Equal(t, link, true)
+	assert.Equal(t, target, "https://github.com/xuri/excelize")
+
 	link, target, err = f.GetCellHyperLink("Sheet2", "D6")
 	assert.NoError(t, err)
-	t.Log(link, target)
+	assert.Equal(t, link, false)
+	assert.Equal(t, target, "")
+
 	link, target, err = f.GetCellHyperLink("Sheet3", "H3")
 	assert.EqualError(t, err, "sheet Sheet3 does not exist")
-	t.Log(link, target)
+	assert.Equal(t, link, false)
+	assert.Equal(t, target, "")
+
 	assert.NoError(t, f.Close())
 
 	f = NewFile()
@@ -709,6 +724,14 @@ func TestSetCellStyleNumberFormat(t *testing.T) {
 	col := []string{"L", "M", "N", "O", "P"}
 	data := []int{0, 1, 2, 3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49}
 	value := []string{"37947.7500001", "-37947.7500001", "0.007", "2.1", "String"}
+	expected := [][]string{
+		{"37947.7500001", "37948", "37947.75", "37948", "37947.75", "3794775%", "3794775.00%", "3.79E+04", "37947.7500001", "37947.7500001", "11-22-03", "22-Nov-03", "22-Nov", "Nov-03", "6:00 pm", "6:00:00 pm", "18:00", "18:00:00", "11/22/03 18:00", "37947", "37947", "37947.75", "37947.75", "37947.7500001", "37947.7500001", "37947.7500001", "37947.7500001", "00:00", "910746:00:00", "37947.7500001", "3.79E+04", "37947.7500001"},
+		{"-37947.7500001", "-37948", "-37947.75", "-37948", "-37947.75", "-3794775%", "-3794775.00%", "-3.79E+04", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "(37947)", "(37947)", "(-37947.75)", "(-37947.75)", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-37947.7500001", "-3.79E+04", "-37947.7500001"},
+		{"0.007", "0", "0.01", "0", "0.01", "1%", "0.70%", "7.00E-03", "0.007", "0.007", "12-30-99", "30-Dec-99", "30-Dec", "Dec-99", "0:10 am", "0:10:04 am", "00:10", "00:10:04", "12/30/99 00:10", "0", "0", "0.01", "0.01", "0.007", "0.007", "0.007", "0.007", "10:04", "0:10:04", "0.007", "7.00E-03", "0.007"},
+		{"2.1", "2", "2.10", "2", "2.10", "210%", "210.00%", "2.10E+00", "2.1", "2.1", "01-01-00", "1-Jan-00", "1-Jan", "Jan-00", "2:24 am", "2:24:00 am", "02:24", "02:24:00", "1/1/00 02:24", "2", "2", "2.10", "2.10", "2.1", "2.1", "2.1", "2.1", "24:00", "50:24:00", "2.1", "2.10E+00", "2.1"},
+		{"String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String", "String"},
+	}
+
 	for i, v := range value {
 		for k, d := range data {
 			c := col[i] + strconv.Itoa(k+1)
@@ -724,7 +747,9 @@ func TestSetCellStyleNumberFormat(t *testing.T) {
 				t.FailNow()
 			}
 			assert.NoError(t, f.SetCellStyle("Sheet2", c, c, style))
-			t.Log(f.GetCellValue("Sheet2", c))
+			cellValue, err := f.GetCellValue("Sheet2", c)
+			assert.Equal(t, expected[i][k], cellValue)
+			assert.NoError(t, err)
 		}
 	}
 	var style int
diff --git a/rows.go b/rows.go
index 9269ac6..fdb9374 100644
--- a/rows.go
+++ b/rows.go
@@ -857,7 +857,10 @@ func (f *File) SetRowStyle(sheet string, start, end, styleID int) error {
 	if end > TotalRows {
 		return ErrMaxRows
 	}
-	if styleID < 0 {
+	s := f.stylesReader()
+	s.Lock()
+	defer s.Unlock()
+	if styleID < 0 || s.CellXfs == nil || len(s.CellXfs.Xf) <= styleID {
 		return newInvalidStyleID(styleID)
 	}
 	ws, err := f.workSheetReader(sheet)
diff --git a/rows_test.go b/rows_test.go
index 829a27a..02e2d20 100644
--- a/rows_test.go
+++ b/rows_test.go
@@ -956,7 +956,10 @@ func TestSetRowStyle(t *testing.T) {
 	assert.NoError(t, f.SetCellStyle("Sheet1", "B2", "B2", style1))
 	assert.EqualError(t, f.SetRowStyle("Sheet1", 5, -1, style2), newInvalidRowNumberError(-1).Error())
 	assert.EqualError(t, f.SetRowStyle("Sheet1", 1, TotalRows+1, style2), ErrMaxRows.Error())
+	// Test set row style with invalid style ID.
 	assert.EqualError(t, f.SetRowStyle("Sheet1", 1, 1, -1), newInvalidStyleID(-1).Error())
+	// Test set row style with not exists style ID.
+	assert.EqualError(t, f.SetRowStyle("Sheet1", 1, 1, 10), newInvalidStyleID(10).Error())
 	assert.EqualError(t, f.SetRowStyle("SheetN", 1, 1, style2), "sheet SheetN does not exist")
 	assert.NoError(t, f.SetRowStyle("Sheet1", 5, 1, style2))
 	cellStyleID, err := f.GetCellStyle("Sheet1", "B2")
diff --git a/styles.go b/styles.go
index 55ee175..87c4863 100644
--- a/styles.go
+++ b/styles.go
@@ -2629,6 +2629,14 @@ func (f *File) SetCellStyle(sheet, hCell, vCell string, styleID int) error {
 	makeContiguousColumns(ws, hRow, vRow, vCol)
 	ws.Lock()
 	defer ws.Unlock()
+
+	s := f.stylesReader()
+	s.Lock()
+	defer s.Unlock()
+	if styleID < 0 || s.CellXfs == nil || len(s.CellXfs.Xf) <= styleID {
+		return newInvalidStyleID(styleID)
+	}
+
 	for r := hRowIdx; r <= vRowIdx; r++ {
 		for k := hColIdx; k <= vColIdx; k++ {
 			ws.SheetData.Row[r].C[k].S = styleID
diff --git a/styles_test.go b/styles_test.go
index 257f98d..47aee5b 100644
--- a/styles_test.go
+++ b/styles_test.go
@@ -342,6 +342,10 @@ func TestSetCellStyle(t *testing.T) {
 	f := NewFile()
 	// Test set cell style on not exists worksheet.
 	assert.EqualError(t, f.SetCellStyle("SheetN", "A1", "A2", 1), "sheet SheetN does not exist")
+	// Test set cell style with invalid style ID.
+	assert.EqualError(t, f.SetCellStyle("Sheet1", "A1", "A2", -1), newInvalidStyleID(-1).Error())
+	// Test set cell style with not exists style ID.
+	assert.EqualError(t, f.SetCellStyle("Sheet1", "A1", "A2", 10), newInvalidStyleID(10).Error())
 }
 
 func TestGetStyleID(t *testing.T) {