diff --git a/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java b/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java
index 993c249..5d0471e 100644
--- a/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java
+++ b/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java
@@ -28,7 +28,9 @@ void parseColumns_xlsx(@TempDir Path dir) throws IOException {
     assertThat(columns).contains(
         new Column("Firstname", String.class, 255), new Column("ZIP", Integer.class),
         new Column("Amount", Double.class), new Column("Birthdate", Timestamp.class), // should be a date
-        new Column("Note", String.class, 811)
+        new Column("Note", String.class, 811),
+        new Column("Column contains texts in incorrect number format", String.class, 255),
+        new Column("Column contains both text and numeric", String.class, 255)
     );
   }
 
diff --git a/excel-importer-test/src_test/com/axonivy/util/excel/test/sample.xlsx b/excel-importer-test/src_test/com/axonivy/util/excel/test/sample.xlsx
index 9d37210..891f81e 100644
Binary files a/excel-importer-test/src_test/com/axonivy/util/excel/test/sample.xlsx and b/excel-importer-test/src_test/com/axonivy/util/excel/test/sample.xlsx differ
diff --git a/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java b/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java
index 7dbd622..5c9ffd4 100644
--- a/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java
+++ b/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java
@@ -1,12 +1,14 @@
 package com.axonivy.util.excel.importer;
 
 import java.sql.Timestamp;
+import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.apache.commons.lang3.StringUtils;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.CellType;
 import org.apache.poi.ss.usermodel.DateUtil;
@@ -87,11 +89,40 @@ private static void updateColumn(Column column, Cell cell) {
         && !CellUtils.isInteger(cell)) {
       column.setType(Double.class);
     }
+    if (cell.getCellType() == CellType.STRING) {
+      column.setType(String.class);
+      column.setDatabaseFieldLength(DEFAULT_STRING_LENGTH);
+    }
     if (column.getType().equals(String.class)) {
-      var cellLength = cell.getStringCellValue().length();
-      if (cellLength > column.getDatabaseFieldLength()) {
-        column.setDatabaseFieldLength(cellLength);
+      var cellValue = getCellValueAsString(cell);
+      if (cellValue.length() > column.getDatabaseFieldLength()) {
+        column.setDatabaseFieldLength(cellValue.length());
+      }
+    }
+  }
+
+  public static String getCellValueAsString(Cell cell) {
+    if (cell == null) {
+      return StringUtils.EMPTY;
+    }
+    switch (cell.getCellType()) {
+    case STRING:
+      return cell.getStringCellValue();
+    case NUMERIC:
+      if (DateUtil.isCellDateFormatted(cell)) {
+        return cell.getDateCellValue().toString();
+      } else {
+        DecimalFormat decimalFormat = new DecimalFormat("#");
+        decimalFormat.setMaximumFractionDigits(0);
+        decimalFormat.setGroupingUsed(false);
+        return decimalFormat.format(cell.getNumericCellValue());
       }
+    case BOOLEAN:
+      return String.valueOf(cell.getBooleanCellValue());
+    case FORMULA:
+      return cell.getCellFormula();
+    default:
+      return StringUtils.EMPTY;
     }
   }
 }