No problems... You added 5 gallons of beer to some foam... if you had the sanitizer at the correct strength… and you removed 99% of it think how diluted it is now…
Here is a description from Jon Palmers “How to Brew”
Star San is an acidic sanitizer from the makers of PBW and was developed especially for sanitizing brewing equipment. It requires only 30 seconds of contact time and does not require rinsing. Unlike other no-rinse sanitizers, Star San will not contribute off-flavors at higher than recommended concentrations. The recommended usage is one fluid ounce per 5 gallons of water. The solution can be put in a spray bottle and used as a spray-on sanitizer for glassware or other items that are needed in a hurry. The foam is just as effective as immersion in the solution. Also, the surfactant used in Star San will not affect the head retention of beer like those used in detergents.
Star San is my preferred sanitizer for all usages except those that I can conveniently do in the dishwasher. A solution of Star San has a long usage life and an open bucket of it will remain active for several days. Keeping a solution of Star San in a closed container will increase its shelf life. The viability of the solution can be judged by its clarity; it turns cloudy as the viability diminishes.
One last note on this product: Because it is listed as a sanitizer and bactricide by the FDA and EPA, the container must list disposal warnings that are suitable for pesticides. Do not be alarmed, it is less hazardous to your skin than bleach.