Error after moving an item to a group (#923226175)

I'm consistently seeing an error after moving an item to a group. The sequence of events I use is this:

1. Select an item from my library with the mouse and drag it to a group.
2. Press the down-arrow key to see the next item. The Zotero report-this-error message immediately shows up in the middle pane.

I uploaded error report #923226175. I also tried rebuilding the Zotero sqlite library (TDHU9173), but the error still occurred. I'm using Zotero 2.0b3 on MacOSX with Firefox 3.5b4.

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