This is a very rough question, so I can only give a rough answer.
There are two ways to find errors when scraping.
The following is an example of python, but it is
for languages ​​around the world There should be a function to do the same processing.

Part 1. Determine if there is a specific element in the if statement
In the example, it is determined whether or not there is even one element whose class attribute is hogehoge

if len (driver.find_elements_by_class_name ('hogehoge'))>0:
    # Process when there is a specific element
else:
    # Process when there is no specific element

Part 2. Exception handling with try-except
In the example, when trying to click an element whose class attribute is hogehoge
Processing when an error is reported that there is no such element

try:
    driver.find_element_by_class_name ('hogehoge'). click ()
    # Process when there is a specific element
except NoSuchElementException:
    # Process when a specific element is not found