diff --git a/__test__/formatters/cells/generatorNumberCell.spec.js b/__test__/formatters/cells/generatorNumberCell.spec.js
index e60effc..2382744 100644
--- a/__test__/formatters/cells/generatorNumberCell.spec.js
+++ b/__test__/formatters/cells/generatorNumberCell.spec.js
@@ -1,9 +1,15 @@
 import generatorNumberCell from '../../../src/formatters/cells/generatorNumberCell';
 
 export const expectedXML = '<c r="A1"><v>1000</v></c>';
+export const expectedErrorXML = '<c r="A1"><v>NaN</v></c>';
 
 describe('Cell of type Number', () => {
   it('Should create a new xml markup cell', () => {
     expect(generatorNumberCell(0, 1000, 1)).toBe(expectedXML);
   });
+
+  it('Should create a new xml markup cell with NaN when there is not a number', () => {
+    expect(generatorNumberCell(0, '</v></c><c><v>text', 1)).toBe(expectedErrorXML);
+  });
 });
+
diff --git a/src/formatters/cells/generatorNumberCell.js b/src/formatters/cells/generatorNumberCell.js
index 7c2612c..13100ee 100644
--- a/src/formatters/cells/generatorNumberCell.js
+++ b/src/formatters/cells/generatorNumberCell.js
@@ -1,3 +1,7 @@
 import generatorCellNumber from '../../commons/generatorCellNumber';
 
-export default (index, value, rowIndex) => (`<c r="${generatorCellNumber(index, rowIndex)}"><v>${value}</v></c>`);
+export default (index, value, rowIndex) => (`<c r="${generatorCellNumber(index, rowIndex)}"><v>${validateNumber(value)}</v></c>`);
+
+const validateNumber = (value) => {
+    return (isNaN(value))?  'NaN' : value;  
+}
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