Why is the particle "ni" used here?

I hope whoever reads this will have a good day.
I had a question regarding a sentence i have come across : "健康のために、毎朝に走っています。
In this sentence,the particle “ni” comes after a regular interval (every morning). Isnt this a grammatical error ?
Thanks in advance !

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Edit: see @GrumpyPanda’s reply, it does appear to be an error.

Not an error, no. Time expressions are often followed by に. With regular intervals using 毎, に is correct but you will often see it omitted like with many other time phrases.

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Alright,thank you for your time.
I was just wondering because in Genki 1 it says that you do not use ni with regular intervals but good to know that its not an error :DD

According to a random hinative post it is also incorrect :thinking:

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Interesting. I have vague recollection of seeing these words with に in use, but as most of my written exposure is just from following artists on twitter and the like it’s entirely possible this was just a mistake on their part any time I saw it. Thank you for doing a little more digging!

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