Reopening a github bug?

I pressed the "Comment and Close" button by accident (who on Earth designed that layout?!). Is anyone here able to reopen a bug, or do I need to create a new one and copy the contents over?
https://github.com/vanillaforums/Garden/issues/closed/#issue/634
https://github.com/vanillaforums/Garden/issues/closed/#issue/634
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