Logo':logo.image_tag(self) AttributeError: 'NoneType' object has no attribute 'image_tag'

from . import models

def get_logo(request):
    logo=models.AppSetting.objects.first()
    data={
        'logo':logo.image_tag(self)
    }
    return data

`

This is my coding part here it is showing error. Can anyone please help me to fix it?

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