This looks to be a PHP/Database error, but IANAD, so it is not much more than a guess on my part. Would suggest you place this as a Moodle Tracker Item, AND at the plugin page, enter the details of any error message you get in a message to the maintainer. I am sure that Andreas would only be too willing to help - if he knows about it. BTW, the last update to the block was in October last year, so previous issues may have been resolved then. This may be something new.
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