We have seen some similar reports such as this one, would you mind opening a ticket on support.atlassian.com so we can further investigate this? There's a workaround available as well that might apply to your case.
We'll wait for your ticket.
How's it going?? We've seen this error a few times, and it is usually due to a rogue App Link ID in the Confluence database. Support has to go in and remove that entry to clear it up. It doesn't require a restart, but we do need to make a DB backup and directly access the DB to get it sorted. This is assuming you've tried all the things locally like clearing your browser cache and offline files.
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