Laravel 5.3 image upload exception for txt and csv file.

I have used following code to validate the image file. While when I upload the txt or csv file its throw an exception (getimagesize(): Read error!).

$rules = [ 'mobile_image'=>'mimes:jpg,jpeg,gif,png|dimensions:width=710,height=400', 'web_image'=>'mimes:jpg,jpeg,gif,png|dimensions:width=1182,height=300', ]; $validator = Validator::make($validateData, $rules); if($validator->fails()){ }