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Plugin Update fails #1057
Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.
I have read the FAQ.
Some plugin that you installed is returning an incomplete update definition here. OctoPrint doesn't capture that correctly (that is a problem to solve in OctoPrint to prevent stuff like this to be caused by incorrectly implemented plugins), however you should also figure out which plugin that is uninstall it and report it to the plugin author (or fix it yourself if that author happens to be you).