Exception while uninstalling add-on: null

I’m running 3.0.2 on a raspberry pi 4 restored from a 2.5.x backup. Everything is working pretty well except I can’t add or remove bindings, getting the error below.

2021-06-07 14:44:26.547 [ERROR] [t.core.internal.addons.AddonResource] - Exception while uninstalling add-on: null

I don’t see those keywords anywhere in search and am unsure what logging settings to change to troubleshoot. Any tips? Did the clean-cache process, reboot, etc.

Oh, also, it appears I removed it from the karaf console, but it still appears in the UI, and adding or removing other items from the UI still report this error.