Report ID: 1922131793 & 623976304 (Cannot duplicate Dictionary entries)

It's really strange, but I cannot duplicate Dictionary entries. When I just, Zotero just doesn't work. When I click another item, a white windows appears with this inscription: "An error has occurred. Please restart Firefox".
I've tried with two different Dictionary entries, and happens the same. But with other items (e.g. books, encyclopaedia entries, journal articles, etc.) works fine.
I work with Zotero 1.5-sync3.2, Firefox 3.0.3 and Windows XP.

Thanks for your help.

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