diff --git a/MoppApp/MoppApp/Extensions/URL+Additions.swift b/MoppApp/MoppApp/Extensions/URL+Additions.swift
index 030c5c36..4a2604de 100644
--- a/MoppApp/MoppApp/Extensions/URL+Additions.swift
+++ b/MoppApp/MoppApp/Extensions/URL+Additions.swift
@@ -28,24 +28,22 @@ extension URL {
     func isValidPath() -> Bool {
         return !self.pathComponents.contains("..")
     }
-}
 
-class ValidPath {
-    static func getValidPath(url: URL) -> URL {
+    func getValidPath() -> URL? {
         guard let appDirectoryURL = FileManager.default.urls(for: .applicationDirectory, in: .userDomainMask).first else {
-            return URL(string: "")!
+            return nil
         }
 
         guard let subdirectoryURLs = try? FileManager.default.contentsOfDirectory(at: appDirectoryURL, includingPropertiesForKeys: nil, options: .skipsHiddenFiles) else {
-                return URL(string: "")!
+                return nil
             }
             
             for subdirectoryURL in subdirectoryURLs {
                 let subdirectoryFilePath = FilePath(stringLiteral: subdirectoryURL.path)
-                if (FilePath(stringLiteral: url.path).starts(with: subdirectoryFilePath.lexicallyNormalized())) {
+                if (FilePath(stringLiteral: self.path).starts(with: subdirectoryFilePath.lexicallyNormalized())) {
                     return URL(fileURLWithPath: subdirectoryFilePath.description)
                 }
             }
-            return URL(string: "")!
+            return nil
     }
 }
diff --git a/MoppApp/MoppApp/MoppApp.swift b/MoppApp/MoppApp/MoppApp.swift
index b14b2455..c4a14960 100644
--- a/MoppApp/MoppApp/MoppApp.swift
+++ b/MoppApp/MoppApp/MoppApp.swift
@@ -323,11 +323,11 @@ class MoppApp: UIApplication, URLSessionDelegate, URLSessionDownloadDelegate {
                 pathExtension = MimeTypeExtractor.determineContainer(mimetype: MimeTypeExtractor.getMimeTypeFromContainer(filePath: newUrl), fileExtension: newUrl.pathExtension)
 
                 do {
-                    guard newUrl.isValidPath() else {
+                    guard let validUrl = newUrl.getValidPath(), validUrl.isValidPath() else {
                         printLog("Unable to open file. Invalid path: \(newUrl.path)")
                         return false
                     }
-                    let newData: Data? = try Data(contentsOf: ValidPath.getValidPath(url: newUrl))
+                    let newData: Data? = try Data(contentsOf: validUrl)
                     let fileName: String = newUrl.deletingPathExtension().lastPathComponent.sanitize()
                     let tempDirectoryPath: URL? = MoppFileManager.shared.tempCacheDirectoryPath()
                     guard let tempDirectory = tempDirectoryPath else {
@@ -343,11 +343,11 @@ class MoppApp: UIApplication, URLSessionDelegate, URLSessionDownloadDelegate {
                         return false
                     }
                     do {
-                        guard filePath.isValidPath() else {
+                        guard let validUrl = filePath.getValidPath(), validUrl.isValidPath() else {
                             printLog("Unable to write to file. Invalid path: \(filePath.path)")
                             return false
                         }
-                        try newUrlData.write(to: ValidPath.getValidPath(url: filePath), options: .atomic)
+                        try newUrlData.write(to: validUrl, options: .atomic)
                         newUrl = filePath
                         if !isFileEmpty {
                             fileUrls.append(newUrl)
@@ -375,7 +375,7 @@ class MoppApp: UIApplication, URLSessionDelegate, URLSessionDownloadDelegate {
                             newUrl.deletePathExtension()
                             newUrl.appendPathExtension(ContainerFormatCdoc)
                         }
-                        guard newUrl.isValidPath() else {
+                        guard let validUrl = newUrl.getValidPath(), validUrl.isValidPath() else {
                             printLog("Unable to move file. Invalid path: \(newUrl.path)")
                             return false
                         }