diff --git a/Tiobon.Core.Common/Helper/NPOIHelper.cs b/Tiobon.Core.Common/Helper/NPOIHelper.cs
index 4301bb1f..73987eb1 100644
--- a/Tiobon.Core.Common/Helper/NPOIHelper.cs
+++ b/Tiobon.Core.Common/Helper/NPOIHelper.cs
@@ -285,12 +285,17 @@ public class NPOIHelper
         for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
         {
             IRow row = sheet.GetRow(i);
+
+            if(row is null)
+                continue;
             //if (row.GetCell(row.FirstCellNum) != null && row.GetCell(row.FirstCellNum).ToString().Length > 0)
             //if (row.GetCell(row.FirstCellNum) != null)
             {
                 DataRow dataRow = dt.NewRow();
                 for (int j = row.FirstCellNum; j < cellCount; j++)
                 {
+                    if(j<0)
+                        continue;
                     if (row.GetCell(j) != null)
                     {
                         DateTime dateV = DateTime.MinValue;