cannot delete products from wishlist

Added a few products to my wish list.
Then visited url /user/1/wishlist to view my wishlist
When trying to delete any of them from the wishlist, I received the following message:
Notice: Trying to get property of non-object in commerce_wishlist_delete() (line 173 of /var/www/sites/all/modules/commerce_wishlist/commerce_wishlist.module).
Product was not removed from the list.