There is no _idn_uri_convert function in or being called by the Guzzle build we're using. I'm guessing you've something else installed loading a newer version of Guzzle trying to use that function, but didn't load it. That something else is most likely a Joomla system plugin to be able to load on all pages or is a module also displayed in your control panel. We're using version 4.2.2 and looks like that function was introduced somewhere around version 6.
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