Cucumber for Appian, when an alert type window is opened by webdriver, error message "org.openqa.selenium.UnhandledAlertException: unexpected alert open: {Alert text : Are you sure you want to leave?}" is displayed and the test execution is stopp

Cucumber for Appian Framework  22.2.1, when running tests and an alert type window is opened by webdriver, error message "org.openqa.selenium.UnhandledAlertException: unexpected alert open: {Alert text : Are you sure you want to leave?}" is displayed on the test runner console and the test execution is stopped. Any idea why this is happening and something to work around?

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