TourApplicationIT.verifyTourFeatures is flickering

org.openqa.selenium.NoSuchElementException: Unable to locate element: .popover\-title

org.openqa.selenium.NoSuchElementException: Unable to locate element: .popover\-title
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)	
	at java.lang.reflect.Constructor.newInstance(Constructor.java:481)	
	at org.openqa.selenium.remote.ErrorCodec.decode(ErrorCodec.java:167)	
	at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:138)	
	at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:50)	
	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:190)	
	at org.openqa.selenium.remote.TracedCommandExecutor.execute(TracedCommandExecutor.java:53)	
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:545)	
	at org.openqa.selenium.remote.ElementLocation$ElementFinder$2.findElement(ElementLocation.java:165)	
	at org.openqa.selenium.remote.ElementLocation.findElement(ElementLocation.java:59)	
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:368)	
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:362)	
	at org.xwiki.test.ui.XWikiWebDriver.findElement(XWikiWebDriver.java:714)	
	at org.xwiki.tour.test.po.PageWithTour.getStepTitle(PageWithTour.java:65)	
	at org.xwiki.tour.test.ui.TourApplicationIT.tourBoundToPage(TourApplicationIT.java:280)	
	at org.xwiki.tour.test.ui.TourApplicationIT.verifyTourFeatures(TourApplicationIT.java:68)	
	at java.lang.reflect.Method.invoke(Method.java:569)	
	at java.util.ArrayList.forEach(ArrayList.java:1511)	
	at java.util.ArrayList.forEach(ArrayList.java:1511)	
	at java.util.ArrayList.forEach(ArrayList.java:1511)