[3.3.x] Support Forum • Fatal error when try to check updates for extensions

Code:

Fatal error: Uncaught InvalidArgumentException: Unable to parse URI: http:// in ..../forum/vendor/guzzlehttp/psr7/src/Uri.php:72 Stack trace: #0 ..../forum/vendor/guzzlehttp/psr7/src/Utils.php(423): GuzzleHttp\Psr7\Uri->__construct() #1 ..../forum/vendor/guzzlehttp/psr7/src/functions.php(41): GuzzleHttp\Psr7\Utils::uriFor() #2 ..../forum/vendor/guzzlehttp/guzzle/src/Client.php(72): GuzzleHttp\Psr7\uri_for() #3 ..../forum/phpbb/file_downloader.php(51): GuzzleHttp\Client->__construct() #4 ..../forum/phpbb/file_downloader.php(75): phpbb\file_downloader->create_client() #5 ..../forum/phpbb/version_helper.php(384): phpbb\file_downloader->get() #6 ..../forum/phpbb/version_helper.php(354): phpbb\version_helper->get_versions() #7 ..../forum/phpbb/version_helper.php(273): phpbb\version_helper->get_versions_matching_stability() #8 ..../forum/phpbb/extension/manager.php(557): phpbb\version_helper->get_ext_update_on_branch() #9 ..../forum/includes/acp/acp_extensions.php(560): phpbb\extension\manager->version_check() #10 ..../forum/includes/acp/acp_extensions.php(152): acp_extensions->list_available_exts() #11 ..../forum/includes/functions_module.php(684): acp_extensions->main() #12 ..../forum/adm/index.php(81): p_master->load_active() #13 {main} thrown in ..../forum/vendor/guzzlehttp/psr7/src/Uri.php on line 72