diff --git a/src/mask.class.ts b/src/mask.class.ts
index 750f1d2..6c8d9e1 100644
--- a/src/mask.class.ts
+++ b/src/mask.class.ts
@@ -154,7 +154,7 @@ export default class Mask {
         // fill props needed
 
         this._props = {
-            masks:       Array.isArray(props.masks) ? props.masks.map(m => m.toString()) : [ props.masks ],
+            masks:       Array.isArray(props.masks) ? props.masks.map(m => m.toString()) : [ props.masks.toString() ],
             patterns:    props.patterns    ?? Mask.defaultPatterns,
             placeholder: props.placeholder ?? '',
             reverse:     props.reverse     ?? false,
diff --git a/tests/mask.spec.ts b/tests/mask.spec.ts
index 0c3c216..e2f7765 100644
--- a/tests/mask.spec.ts
+++ b/tests/mask.spec.ts
@@ -27,6 +27,7 @@ describe('Mask class tests', () => {
     test('Throw errors', () => {
 
         expect(() => new Mask({
+            // @ts-ignore
             masks: []
         })).toThrow(/mask/gim);