fix morph

app/javascript/elements/masked_input.js

@@ -1,14 +1,13 @@
 export default class extends HTMLElement {
   connectedCallback () {
-    const maskedToken = this.input.value
-
     this.input.addEventListener('focus', () => {
+      this.maskedToken = this.input.value
       this.input.value = this.dataset.token
       this.input.select()
     })
 
     this.input.addEventListener('focusout', () => {
-      this.input.value = maskedToken
+      this.input.value = this.maskedToken
     })
   }