Painful nightly leg cramp 2 weeks before marathon

Tonight I had a terrible leg cramp for the first time in months.
Should have been my final half marathon block training before the marathon end September.
I read I should better skip (still hurts). Also wanted to test the race shoes today.

Any tips at this stage after four month of marathon training this feels like a bit of a setback. I know it won’t affect fitness but it would have been sort of a pace and shoe test today.
Right to skip, listening to my body?