diff --git a/projects/ui/src/lib/components/po-field/po-input/po-mask.spec.ts b/projects/ui/src/lib/components/po-field/po-input/po-mask.spec.ts
index 863832122e..48fb267981 100644
--- a/projects/ui/src/lib/components/po-field/po-input/po-mask.spec.ts
+++ b/projects/ui/src/lib/components/po-field/po-input/po-mask.spec.ts
@@ -706,6 +706,13 @@ describe('PoMask', () => {
     expect(mask.valueToModel).toBe('1-1-1');
   });
 
+  it('should return value "" to model and validMask return false', () => {
+    mask.formatModel = true;
+    mask.formatValue('', '9-9-9');
+    expect(mask.valueToModel).toBe('');
+    expect(mask.validMask()).toBe(false);
+  });
+
   it('should test replaceMask function', () => {
     expect(mask.replaceMask('0')).toEqual(/[0]/);
     expect(mask.replaceMask('1')).toEqual(/[0-1]/);