[beta] Error when adding new files

It looks like every time I add a new file (happened for both PDF and html) Zotero throws an error (white/blank middle panle: "An Error has Occured, Please Restart Firefox") and requires a Firefox restart.

Error report ID: 2146987374

I think the relevant error is:
JavaScript Error: "[Exception... "'[Exception... "Component returned failure code: 0x80630003 (NS_ERROR_STORAGE_CONSTRAINT) [mozIStorageStatement.execute]" nsresult: "0x80630003 (NS_ERROR_STORAGE_CONSTRAINT)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: :: line 145" data: no] [QUERY: INSERT INTO fulltextItemWords (wordID, itemID) SELECT wordID, ? FROM fulltextWords JOIN indexing.fulltextWords USING(word)] [ERROR: columns wordID, itemID are not unique]' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "native frame :: :: :: line 0" data: no]"]

This is with the current beta on Firefox 25 for Ubuntu. Tons of other add-ons installed, so could be because of that, but I've never had that problem before.

Edit: The File is unindexed after restart and manually triggering indexing again produces the Zotero error
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