The value of 0 is the value that is returned by the indicator, I don't think that there is an error. Those indicators who return 0 are actually rare, normally the returned value (where the indicator doesn't show anything) is EMPTY_VALUE, which is some big integer. In other words, I see the value of as very intentional, the developer selected that value to be returned. If there was an error, I don't think that you would see 0.
Try with Candle ID bigger than 0.





I tested it on a new project, I saved the description, then I reloaded the page and the description was there.