Vuelidate - Accept 'null' or empty string as valid

I am currently using Vuelidate for a form. There is an input field where the user is allowed to leave it in blank, which is an optional field.

Minimum value, if entered, should be 0 or higher, but If I leave it empty, it will still throw the error. Validation works well for numbers, it executes the error class when entered value is below 0.

Summary: I need to have minValue(0) but also nullable possibility.

I currently have this:

validations: {
    company_name: { 
      minValue: minValue(0)
    }
 }

Template looks like this:

    <input
       id="company_name"
       :value="company_name"
       type="number"
       min="0"
       step="0.01"
       :class="{ 'error': v$.company_name.minValue.$invalid"
     >