Krishna already planned his death and he told Arjuna about how to kill Karna on the 14th night itself. Krishna already knew that Karna cannot be killed in a fair fight, even when he had donated his Kavach and Kundal.
Here is what Krishna tells Arjuna after Ghatotkatch was slain.
"..The man does not exist in this world that could not stay before Karna armed with that dart and looking like Kartikeya in battle. By good luck, his (natural) armour had been taken away. By good luck, his earrings also had been taken away. By good luck, his infallible dart also is now baffled, through Ghatotkacha. Clad in (natural) coat of mail and decked with his (natural) ear-rings, Karna, who had his senses under control, could singly vanquish the three worlds with the very gods. Neither Vasava, nor Varuna the lord of the waters, nor Yama, could venture to approach him. Indeed, if that bull among men had his armour and ear-rings, neither thyself, bending the Gandiva, nor myself, uplifting my discus, called Sudarsana, could vanquish him in battle. For thy good, Karna was divested of his ear-rings by Sakra with the help of an illusion. Similarly was that subjugator of hostile towns deprived of his (natural) armour. Indeed, because Karna, cutting off his (natural) armour and his brilliant car-rings, gave them unto Sakra, it is for that he came to be called Vaikartana. Karna now seems to me to be like an angry snake of virulent poison stupefied by power of incantation, or like a fire of mild flames.."
Here is what Krishna tells Arjuna to do when Karna's wheel will get sunk. Krishna planned out everything.
"..There win occur one opportunity for his slaughter. When his car-wheels will sink in the earth, availing thyself of that opportunity, thou shouldst slay him in that distressful situation. I will make thee a sign beforehand. Warned by it, thou shouldst act. The vanquisher of Vala himself, that foremost of heroes, wielding his thunder, is incapable of slaying the invincible Karna while the latter stands weapon in hand.."
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