[beta] occasional "There has been an error. Restart Zotero"

Error ID: 1351115454
This is probably not going to help much, but since it has happened a couple of time since about the 4.0.22 release I thought I'd mention it. I'm getting the above error (in the middle Zotero pane). Restarting Firefox fixes things, so it's not a big deal and I don't know how to reproduce it (and I have a gazillion other add-ons installed, so that's another variable), but just in case that
[JavaScript Error: "State check failed due to transaction in progress"]
tells you something.
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