When requesting to the Internet – API

I check if there is a trailer there and if there is, it shows a button

But it shows an error, and it doesn’t always show it. It shows only on some individual films..

But every time it shows:

Exception has occurred.

• RangeError (RangeError (index): Invalid value: Valid value range is empty: 0)

I tried checking using == null but it didn’t help

And this happens not only with the trailer, I tried to change it also with genres there, by the way, also through [0] (List) and the same error pops up