added an if statement to catch when we click the last cup to toggle it #25
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when you click on the last cup to fill it, it works fine, but when you click it again it throws:
Uncaught TypeError: Cannot read property 'classList' of null at highlightCups (script.js:13)
so I added an if statement at the beginning of the highlightCup function to prevent this from happening.
if (idx===7 && smallCups[idx].classList.contains("full")) idx--;