more fix in state:

src/views/SignUp.vue

@@ -265,7 +265,7 @@ export default class SignUp extends Vue {
             street: this.address.street,
             town: "",
             city: this.address.city,
-            department: this.address.state.replace("/ /g", "_"),
+            department: this.address.state.replace(/ /g, "_"),
           },
         };
         await User.signUp(data);