An intuitive software erector kit targeted at people new to programming, but with enough potential to stay useful once they've learned, inspired by HyperCard.
If a card is invalid and has an invalid background ID or the background can't be loaded for some other reason, don't crash de-referencing NULL. (We need to protect from web-based exploits)
If a card is invalid and has an invalid background ID or the background can't be loaded for some other reason, don't crash de-referencing NULL. (We need to protect from web-based exploits)