/shareinfo is not required

apps/files_sharing/lib/external/scanner.php

@@ -90,6 +90,7 @@ class Scanner extends \OC\Files\Cache\Scanner {
 		}
 		if ($data['status'] === 'success') {
 			$this->addResult($data['data'], '');
+		} elseif ($data['status'] === 'unsupported') {
 		} else {
 			throw new \Exception(
 				'Error while scanning remote share: "' .

apps/files_sharing/lib/external/storage.php

@@ -27,6 +27,7 @@ namespace OCA\Files_Sharing\External;
 
 use OC\Files\Storage\DAV;
 use OC\ForbiddenException;
+use OCA\FederatedFileSharing\DiscoveryManager;
 use OCA\Files_Sharing\ISharedStorage;
 use OCP\Files\NotFoundException;
 use OCP\Files\StorageInvalidException;
@@ -248,6 +249,12 @@ class Storage extends DAV implements ISharedStorage {
 		$remote = $this->getRemote();
 		$token = $this->getToken();
 		$password = $this->getPassword();
+
+		// If remote is not an ownCloud do not try to get any share info
+		if(!$this->testRemoteUrl($remote . '/status.php')) {
+			return ['status' => 'unsupported'];
+		}
+
 		$url = rtrim($remote, '/') . '/index.php/apps/files_sharing/shareinfo?t=' . $token;
 
 		// TODO: DI