But the knife penetrated the vest and he suffered a slight cut to his back which required stitches.
Israeli soldiers are due to receive the same safety vest following a recent wave of stabbings by Palestinians.
Yaniv Montakyo, a vice president of the company that makes the vest, told Israel`s Channel 2 that he had stabbed Mr Lachover in a section of the vest where there had been no protective material.
He said that an earlier recording had been successful and the reporter had not been harmed.
Linda Bar, a spokeswoman for Israel`s state broadcaster, said the report would be broadcast on Wednesday despite the mishap.
Mr Lachover said on Twitter that he was discharged from hospital after receiving the stitches.
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