SEOChecker: Error validating document '2551'

I am getting below error log continuously in the backoffice logs viewer.
This error log is coming every minute. I have checked all the content pages related to 2551 id but this id does not exist. I have also checked this id the database tables but does not exist there.

I am using Umbraco CMS version 7.15.7 and SEO Checker version is 2.2.5

If anyone fixed this issue before, please let me know. Thanks.

SEOChecker: Error validating document '2551'
System.NullReferenceException: Object reference not set to an instance of an object.
   at SEOChecker.Core.Umbraco.DocumentWrappers.UmbracoDocument..ctor(IContent doc, IContextInfo info)
   at SEOChecker.Core.Repository.Umbraco.UmbracoDocumentRepository.Single(Int32 id, IContextInfo context)
   at SEOChecker.Core.Validation.DocumentValidator.Validate(Int32 documentId, IContextInfo context)
   at SEOChecker.Core.Repository.Queue.AnalyserQueueRepository.ProcessQueue(IContextInfo context)

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/109682-seochecker-error-validating-document-2551