[Python] Getting "Exception UnexpectedAlertPresentException: Alert Text: None" and then...

We're doing automation scripts using the following:

• behave==1.2.5
• splinter==0.7.7
• firefox headless browser

When navigating to a specific page, we're executing the following code:

browser = context.browser
selector_button_checkout = "//*[@id='cart']//div[contains(@class, 'button button-3 localizejs') and text()='CHECKOUT']"
with browser.get_iframe(0) as iframe:
assert iframe.is_element_present_by_xpath(selector_button_checkout, wait_time=30)


We're getting this error:

packages/selenium/webdriver/remote/errorhandler.py", line 237, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.UnexpectedAlertPresentException: Alert Text: None
Message:

Exception UnexpectedAlertPresentException: Alert Text: None
Message:

Traceback (most recent call last):
selenium.common.exceptions.UnexpectedAlertPresentException: Alert Text: None
Message:


Actually, there is no alert nor prompt shown in the web, but anyways we tried to handle it using the Splinter documentation present in here http://splinter.readthedocs.io/en/latest/iframes-and-alerts.html

and we get another exception which is NoAlertPresentException, so we're lost.

Any ideas?

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