Hello, I am having strange issue with Chrome debugger after blurring out of mdbInputDirective input type=number control.  Every time, it comes up with window in debugger with just "undefined".   Do I have to have a <label> after my <input> tag?  What could be causing it to pop-up with undefined after I blur?

Here is my HTML - 

<div class="form-group md-form">

<input mdbInputDirective id="privatePassengerCount" name="privatePassengerCount" type="number" class="form-control" formControlName="privatePassengerCount" [mdbValidate]="false">

<label for="privatePassengerCount" class="">count</label>

</div>