Deleting an SSX prevents any SSX from being processed

When I create a page with 2 SSX objects, then delete the first object, it prevents the 2nd SSX object from being executed at runtime (throws a NullPointerException). The objects look like this:

Before deletion

XWiki.StyleSheetExtension[0]
XWiki.StyleSheetExtension[1]

After deletion

XWiki.StyleSheetExtension[1]

This seems to be due to way com.xpn.xwiki.web.sx.SxDocumentSource.getContent() performs its loop (there's no check to see whether sxObj is null or not).