diff --git a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs
index 9790fe5a..2d16d021 100644
--- a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs
+++ b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs
@@ -325,16 +325,7 @@ private async Task WriteCellAsync(MiniExcelAsyncStreamWriter writer, string cell
 
         private async Task WriteCellAsync(MiniExcelAsyncStreamWriter writer, int rowIndex, int cellIndex, object value, ExcelColumnInfo p, ExcelWidthCollection widthCollection)
         {
-            var columnReference = ExcelOpenXmlUtils.ConvertXyToCell(cellIndex, rowIndex);
-            var valueIsNull = value is null || value is DBNull;
-
-            if (_configuration.EnableWriteNullValueCell && valueIsNull)
-            {
-                await writer.WriteAsync(WorksheetXml.EmptyCell(columnReference, GetCellXfId("2")));
-                return;
-            }
-
-            if (p.CustomFormatter != null)
+            if (p?.CustomFormatter != null)
             {
                 try
                 {
@@ -346,6 +337,15 @@ private async Task WriteCellAsync(MiniExcelAsyncStreamWriter writer, int rowInde
                 }
             }
 
+            var columnReference = ExcelOpenXmlUtils.ConvertXyToCell(cellIndex, rowIndex);
+            var valueIsNull = value is null || value is DBNull;
+
+            if (_configuration.EnableWriteNullValueCell && valueIsNull)
+            {
+                await writer.WriteAsync(WorksheetXml.EmptyCell(columnReference, GetCellXfId("2")));
+                return;
+            }
+
             var tuple = GetCellValue(rowIndex, cellIndex, value, p, valueIsNull);
 
             var styleIndex = tuple.Item1;
diff --git a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs
index 96e16955..312b7d1a 100644
--- a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs
+++ b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs
@@ -325,15 +325,6 @@ private void PrintHeader(MiniExcelStreamWriter writer, List<ExcelColumnInfo> pro
 
         private void WriteCell(MiniExcelStreamWriter writer, int rowIndex, int cellIndex, object value, ExcelColumnInfo columnInfo, ExcelWidthCollection widthCollection)
         {
-            var columnReference = ExcelOpenXmlUtils.ConvertXyToCell(cellIndex, rowIndex);
-            var valueIsNull = value is null || value is DBNull;
-
-            if (_configuration.EnableWriteNullValueCell && valueIsNull)
-            {
-                writer.Write(WorksheetXml.EmptyCell(columnReference, GetCellXfId("2")));
-                return;
-            }
-
             if (columnInfo?.CustomFormatter != null)
             {
                 try
@@ -346,6 +337,15 @@ private void WriteCell(MiniExcelStreamWriter writer, int rowIndex, int cellIndex
                 }
             }
 
+            var columnReference = ExcelOpenXmlUtils.ConvertXyToCell(cellIndex, rowIndex);
+            var valueIsNull = value is null || value is DBNull;
+
+            if (_configuration.EnableWriteNullValueCell && valueIsNull)
+            {
+                writer.Write(WorksheetXml.EmptyCell(columnReference, GetCellXfId("2")));
+                return;
+            }
+
             var tuple = GetCellValue(rowIndex, cellIndex, value, columnInfo, valueIsNull);
 
             var styleIndex = tuple.Item1; // https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.spreadsheet.cell?view=openxml-3.0.1