diff --git a/ClosedXML/Excel/XLWorkbook_Save.cs b/ClosedXML/Excel/XLWorkbook_Save.cs
index 57e3f00..2200894 100644
--- a/ClosedXML/Excel/XLWorkbook_Save.cs
+++ b/ClosedXML/Excel/XLWorkbook_Save.cs
@@ -2127,7 +2127,7 @@
                 {
                     if (types.Length == 1 && types.Single() == XLDataType.Number)
                     {
-                        sharedItems.ContainsSemiMixedTypes = false;
+                        sharedItems.ContainsSemiMixedTypes = containsBlank;
                         sharedItems.ContainsString = false;
                         sharedItems.ContainsNumber = true;
 
@@ -2160,7 +2160,7 @@
                     }
                     else if (types.Length == 1 && types.Single() == XLDataType.DateTime)
                     {
-                        sharedItems.ContainsSemiMixedTypes = false;
+                        sharedItems.ContainsSemiMixedTypes = containsBlank;
                         sharedItems.ContainsNonDate = false;
                         sharedItems.ContainsString = false;
                         sharedItems.ContainsDate = true;
diff --git a/ClosedXML_Tests/Excel/PivotTables/XLPivotTableTests.cs b/ClosedXML_Tests/Excel/PivotTables/XLPivotTableTests.cs
index 919cd2c..eddd1a3 100644
--- a/ClosedXML_Tests/Excel/PivotTables/XLPivotTableTests.cs
+++ b/ClosedXML_Tests/Excel/PivotTables/XLPivotTableTests.cs
@@ -218,7 +218,7 @@
                         new Pastry("Bearclaw", 103, 134, 10.24, "", new DateTime(2016, 04, 27)),
                         new Pastry("Bearclaw", 103, 184, 33.33, "", new DateTime(2016, 05, 20)),
                         new Pastry("Bearclaw", 103, 124, 25, "", new DateTime(2017, 06, 05)),
-                        new Pastry("Danish", 104, 394, -20.24, "", new DateTime(2017, 04, 24)),
+                        new Pastry("Danish", 104, 394, -20.24, "", null),
                         new Pastry("Danish", 104, 190, 60, "", new DateTime(2017, 05, 08)),
                         new Pastry("Danish", 104, 221, 24.76, "", new DateTime(2016, 06, 21)),
 
@@ -236,12 +236,13 @@
                     var sheet = wb.Worksheets.Add("PastrySalesData");
                     // Insert our list of pastry data into the "PastrySalesData" sheet at cell 1,1
                     var table = sheet.Cell(1, 1).InsertTable(pastries, "PastrySalesData", true);
+                    sheet.Cell("F11").Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
                     sheet.Columns().AdjustToContents();
 
                     IXLWorksheet ptSheet;
                     IXLPivotTable pt;
 
-                    for (var i = 1; i <= 4; i++)
+                    for (var i = 1; i <= 5; i++)
                     {
                         // Add a new sheet for our pivot table
                         ptSheet = wb.Worksheets.Add("pvt" + i);
@@ -249,7 +250,7 @@
                         // Create the pivot table, using the data from the "PastrySalesData" table
                         pt = ptSheet.PivotTables.Add("pvt" + i, ptSheet.Cell(1, 1), table);
 
-                        if (i == 1 || i == 4)
+                        if (i == 1 || i == 4 || i == 5)
                             pt.ColumnLabels.Add("Name");
                         else if (i == 2 || i == 3)
                             pt.RowLabels.Add("Name");
@@ -258,6 +259,8 @@
                             pt.RowLabels.Add("Month");
                         else if (i == 2 || i == 4)
                             pt.ColumnLabels.Add("Month");
+                        else if (i == 5)
+                            pt.RowLabels.Add("BakeDate");
 
                         // The values in our table will come from the "NumberOfOrders" field
                         // The default calculation setting is a total of each row/column
diff --git a/ClosedXML_Tests/Resource/Other/PivotTableReferenceFiles/BlankPivotTableField/BlankPivotTableField.xlsx b/ClosedXML_Tests/Resource/Other/PivotTableReferenceFiles/BlankPivotTableField/BlankPivotTableField.xlsx
index eb652c2..7beb531 100644
--- a/ClosedXML_Tests/Resource/Other/PivotTableReferenceFiles/BlankPivotTableField/BlankPivotTableField.xlsx
+++ b/ClosedXML_Tests/Resource/Other/PivotTableReferenceFiles/BlankPivotTableField/BlankPivotTableField.xlsx
Binary files differ