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sentence:

Keep me from having to mingle (I have never seen such construction gerund+infinitive. The only two cases I know is I'm used to doing, I'm looking forward to seeing - we can treat it as an exception)

question:

What rule can I exert to explain this case?

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That is not the exception. Here the verb after the preposition - from - is have. And it's no exception to write having there. The verb have can take a to-infinitive clause to mean obligation, for example, I have to do it. And so it's grammatical to write keep me from having to mingle.

A few similar examples -

I could walk no more than a few feet without having to pause to net an unfamiliar species.

It will save you from having to pay your full deductible two-years in a row.

They're really well-adjusted around this business and understanding the nature of having to take a battering.

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