WebUI.acceptAlert(FailureHandling.CONTINUE_ON_FAILURE) error

I’m looking for a specific element around the loop for a few pages stored in an array.
However, an error occurs when you access the page where alert is executed.

WebUI.delay (30)
WebUI.acceptAlert (FailureHandling).CONTINUE_ON_FAILURE)

The page without an alert is working normally.
An error occurs on the page where the alert is executed.
can you help me?

In this case, use FailureHandling.OPTIONAL. If no alert is present, it throws only WARN, not ERROR.