fix: typo

program/models.py

@@ -149,7 +149,7 @@ class Image(models.Model):
         super().save(*args, **kwargs)
 
         if self.image.name and settings.THUMBNAIL_SIZES:
-            for size in settings.HUMBNAIL_SIZES:
+            for size in settings.THUMBNAIL_SIZES:
                 self.image.thumbnail = self.image.crop[size].name
 
     def delete(self, using=None, keep_parents=False):