If you are using Selenium, then a “NoSuchElementException” could throw a failure to your code. If you are using WebUI keywords, then the same “NoSuchElementException” will not be a failure, but a warning. That’s assuming you are running as FailureHandling.OPTIONAL either within your statement or as your default setting.
Also, if you are running a Test Suite that has several Test Cases, then the “failure” of one Test Case does not stop the Test Suite from moving onto the next case.
If you can give us more information what you are doing and even an error log, then we may be able to give you more information.
Edit: The below might be a good read as well.