Chicago (WGN) -

A family from California had quite a scare at Willis Tower on Wednesday.

After Alejandro Garibay and his group took a photo on The Ledge — a glass enclosure that looks straight down from 1,353 feet above Chicago — the bottom began cracking beneath their feet, but that was actually not the case.

According to a spokesman with Willis Tower, the glass didn't shatter. It was actually a protective coating on the glass that cracked.

"The Ledge was designed with a protective coating that completely covers all glass surfaces to protect against scratches," spokesman Brian Rehme said in a statement. "This coating does not affect the structural integrity of The Ledge in any way. Occasionally, the coating will crack, as it is designed to in order to protect the surface of the glass."