Error in v-model on production

[motahharm]

Hi.

I use and input with v-model:

<input placeholder="نام کاربری"
            class="input"
            name="username" autoComplete='off' v-model="username" />

everything is ok on development but when I build my app I have an error:

and here is error in code:

Who can help me??

[liulinboyi]

There is no minimal reproduction, and I don't know why the error is reported.
But I have no problem testing this code.

<input placeholder="نام کاربری"
            class="input"
            name="username" autoComplete='off' v-model="username" />

Playground Demo link