Crawl fails with an error The
SharePoint item being crawled returned an error when requesting data from the
web service. ( Error from SharePoint site: Data is Null. This method or
property cannot be called on Null values. )
Issue: The SharePoint item being crawled returned an error when requesting data from the web service. ( Error from SharePoint site: Length of parameter Name exceeds specified max for the column )
Solution: Please find the below solutions to resolve
the issues.
1. Check the link :http://support.microsoft.com/kb/2323206/en-us
2. Try to disable the anonymous access on the
default zone web application(in content source)
I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.