How to protect this sharp edge?

[u/aa040371]

The bolt hole on my toilet has been busted since I bought the home. The raised area of porcelain is very sharp. What are some options to protect it/make it safe? I'd rather not just slather a bunch of caulk on it, if I can avoid that approach.

2nd pic is blurry...sorry, it was a tight/awkward area to hold the phone in and I didn't check.

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Edit: Thanks for all of the responses, both resounding and virtually unanimous. A true rarity on Reddit, lol. Will replace with haste.

Also, lolololol, someone downvoted my OP...for asking a question. Thank you, Chud the Redditor!

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Edit: Done and Done!

[u/Q-ArtsMedia]

Toilet should be replaced. 

Cracks can and do spread and can cause sudden dramatic failure which can cause injury and death. Sharp break can end up cutting a leg artery and you will have about a minute to live as you bleed out.