[jurialmunkey]

Without a log I cannot fix the issue because I cannot see the context of the problem and you're using the plugin in a very unconvential manner.

The invalid params json rpc error indicates an item in the list has the incorrect dbid which doesn't exist in your library db - as to why that would occur, it's impossible to tell without the context (could be library unavailable, some other 3rd plugin editing the db, a disk error, item was removed, and so on).

if you know it is possible to get an error retrieving from the database then wouldn't it be pertinent to put in a "try" to handle any possible errors

just 1 opinion

No. The error should be raised because it indicates an problem. There should not be an incorrect DBID added.