TYPO3 Core

If you add a youtube video in the file list and (in my case apparently due to wifi connection problems) the image for the video can't be fetched the FileList view dies with an exception:

Uncaught TYPO3 Exception: cURL error 28: Resolving timed out after 10572 milliseconds (see http://curl.haxx.se/libcurl/c/libcurl-errors.html) | GuzzleHttp\Exception\ConnectException thrown in file /var/www/dev-master.local.typo3.org/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php in line 186. Requested URL: http://dev-master.local.typo3.org/typo3/index.php?M=file_FilelistList&moduleToken=6c88c02377ef9f173eb222e90c7eb5fc0d3dd791&id=1%3A%2Ftestfolder%2F