I'm having an issue with a custom Page/Controller in that, it is fully operational in production if I (the creator, I'm also a system admin) access it, but to everyone else it displays the error
"List has no rows for assignment to SObject
An unexpected error has occurred. Your development organization has been notified."
Now I know this message is related to a query being unable to find any records, but what is confusing is that if I run the page using the login of another admin with the same permissions as me, it doesn't work either, and displays this error, and I've looked around a lot into the permissions of the various user accounts I've tried this on and I can't figure it out. Does anyone have any ideas on solving this?