Gradients-Graphic&Multimedia-Example Crashes when you reach the last preset

Description:

Reaching the last preset causes the example to crash.

Steps to reproduce:

1.Open the Gradients example.

2. Click on next preset until you reach the last one. It is named "Perfect blue".

3. The example will crash after clicking next once more.

Expected behavior:

It should either return to the first preset, either prevent the user from pressing next again.
Observed behavior:

The user can click next, causing the example to crash.

Special notes:

Reaching the last preset will cause the example to crash, however, there is about 100 presets or so.