Firefox freezes when DOI lookup fails

Hello. I'm new to Zotero ... still experimenting with the features and ran into a problem.

When I use the "add item by identifier" feature for a DOI lookup I receive a "lookup fails" message and am not able to escape the message by clicking the "OK" button or enter. Firefox quits responding and I must force quit.

I'm running Firefox 36.0, Mac OS 10.6.8 with Zotero for Firefox 4.0.25.1 and Zotero LibreOffice Integration 3.5.9

Here is one of the DOIs that has led to this issue:
10.1016/j.asw.2014.05.001

I'd very much appreciate any help.
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