Nevermind. Please delete this
I figured since this post hasn't been deleted, I should explain what happened.
So, I added a product, and it made the entire admin's "Products" page return a 500 error. The only way to get it back to normal was to delete the category that the product was put in.
I ended up figuring out what happened. It turns out the product image's name that I added was ".jpg". That's right. Not "image.jpg", just ".jpg", no name, just the file extension. So I guess it tried to turn some code into a .jpg, and the server got confused and returned the 500 error.
My suggestion to the dev team is to possibly make sure that the product images have a proper name before submitting the product.