diff --git a/src/number.ts b/src/number.ts
index 0bc353e..edb37d8 100644
--- a/src/number.ts
+++ b/src/number.ts
@@ -20,7 +20,7 @@ export const processNumber = (value: string, masked = true, opts: MaskOptions):
   const decimal = parts.find((part) => part.type === 'decimal')?.value ?? '.'
   const float = prepare(value, group, decimal)
 
-  if (float === '' || Number.isNaN(float)) return sign
+  if (Number.isNaN(parseFloat(float))) return sign
 
   // allow zero at the end
   const floatParts = float.split('.')
diff --git a/test/number.test.ts b/test/number.test.ts
index 46e772e..2057386 100644
--- a/test/number.test.ts
+++ b/test/number.test.ts
@@ -166,3 +166,11 @@ test('initial brazilian number', () => {
   expect(mask.masked('1.23')).toBe('123')
   expect(mask.masked('1,23')).toBe('1,23')
 })
+
+// https://github.com/beholdr/maska/issues/228
+test('NaN check', () => {
+  const mask = new Mask({ number: { locale: 'uk', fraction: 2 } })
+
+  expect(mask.masked('.')).toBe('')
+  expect(mask.masked(',')).toBe('')
+})