Catch exception when document has been removed from Knowledge Center

There is a plug in available to solve your issue. Plug in name checkObjectExistence

@ajayp Added to the above suggestions, I would like to suggest to clean-up the references. That is, for instance, if you delete a document object from the designer or from the SAIL Forms in the User Interface, it would be good to clean up the references (for instance, document id in tables) post deletion of the document object. That way you may avoid the usage of plugin as well at times.

@ajayp, just want to add some info here. Generally, before the form is submitted using SAIL document upload field, the document is saved on the server (and not tearget KC) with an inactive temporary Id and we cannot perform any operations with that Id. Once the form is submitted using SAIL document upload field, the document is saved with a new version. This might be the possible reason for the missing document. An alternative is to have a "Upload" button which helps the document getting upload into the targeted KC directly. You will now have the actual document id, with which you can convert it into a document and perform a variety of validations.