Many cases, like #756, the selecting of a window may fail because the windows is not yet open. Then a common solution is to do this:

| Wait Until Keyword Succeeds | 5 | 1 | Select Window | window_title |

It would be better to create keyword that allow to wait a window is opened, example:

| Wait Until Window Is Open | window_title | timeout |
| Select Window | window_title |

Other option would be to enhance the Select Window to perform polling and add a timeout

| Select Window | window_title | timeout |