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It is always safer for a diabetic to have no insulin (or a half dose) than too much insulin as too much can cause the blood sugar to be dangerously low. I usually recommend people skin the insulin dose if a dog does not eat or only give 1/4-1/2 of the dose depending on how much it is. If he skips another meal, I recommend he be examined as a diabetic needs to eat in order to get insulin but insulin is necessary at a ow level at all times as it helps with keeping the body's metabolism regulated.
Tonight, I wold recommend giving no inulin and offering food in the morning. If he does not eat, then I recommend a recheck with your veterinarian.
Does this help to address your question tonight?