vulnscan:934 Uncaught TypeError: Cannot read property 'top' of undefined

This error is typically thrown when trying to access the 'top' property of an object that is undefined. It is likely that the code is attempting to access the 'top' property of an element that does not exist or has not been properly defined.

To troubleshoot this error, you can try checking the code where the error is occurring to ensure that the element being targeted actually exists and is properly defined. You can also try using console.log statements to track the value of the element and any related variables to help identify the issue.