Beer in the airlock

So I brewed a batch of IPA last night, and I've got serious krausen going on in my fermenter today. I just checked on it, and some of the foam has worked its way into the airlock (the sanitizer is now a brownish color.) It's a 6-gallon carboy with a 5-gallon batch so I didn't think I'd need a blowoff tube. I'm assuming it's harmless because the airlock was full of sanitizer, but I just want to double check.

Did that on my last batch. It's fine, no worries. I'd probably change/clean the airlock though.

Cool. Figured I would let krausen finish and then clean out the airlock. Thanks for the peace of mind.