Remove invalid mounts from the active fs

apps/files_sharing/lib/external/storage.php

@@ -142,6 +142,7 @@ class Storage extends DAV implements ISharedStorage {
 					// since this is permanent (re-sharing the file will create a new token)
 					// we remove the invalid storage
 					$this->manager->removeShare($this->mountPoint);
+					$this->manager->getMountManager()->removeMount($this->mountPoint);
 					throw new StorageInvalidException();
 				} else {
 					// ownCloud instance is gone, likely to be a temporary server configuration error

lib/private/files/mount/manager.php

@@ -27,6 +27,10 @@ class Manager {
 	 * @param string $mountPoint
 	 */
 	public function removeMount($mountPoint) {
+		$mountPoint = Filesystem::normalizePath($mountPoint);
+		if (strlen($mountPoint) > 1) {
+			$mountPoint .= '/';
+		}
 		unset($this->mounts[$mountPoint]);
 	}