diff --git a/Backend/Controllers/FileHandler/FileHandler.php b/Backend/Controllers/FileHandler/FileHandler.php
index 4287865..7abe854 100644
--- a/Backend/Controllers/FileHandler/FileHandler.php
+++ b/Backend/Controllers/FileHandler/FileHandler.php
@@ -2,17 +2,17 @@
 /**
  * @param string $gameFileName
  * @param string $gameFileTmp
- * @return string|null
+ * @return string
  */
 
-function ZipFileHandler(string $gameFileName, string $gameFileTmp): ?string
-{
-
+function ZipFileHandler(string $gameFileName, string $gameFileTmp){
     $fileExtGame = explode('.', $gameFileName);
     $fileActualExtGame = strtolower(end($fileExtGame));
 
-   $allowedFileTypeGame = array('zip');
-    if(in_array($fileActualExtGame,$allowedFileTypeGame)){
+    $headerType = mime_content_type($gameFileTmp);
+    $headerTypeMatch = array('application/zip');
+
+    if(in_array($headerType,$headerTypeMatch)){
         $gameFileNewName = uniqid("", true). "." .  $fileActualExtGame;
         if(empty($gameFileName)){
             header("location: ../../../Frontend/index.php?error=emptyFile");
@@ -20,27 +20,25 @@ function ZipFileHandler(string $gameFileName, string $gameFileTmp): ?string
         }
         rename($gameFileTmp,"../../Games/".$gameFileNewName);
         return $gameFileNewName;
+    }else{
+        header("location: location: ../../../Frontend/index.php?error=Wrong%20File%20Type");
     }
-
-
-
 return NULL;
 }
 
 /**
  * @param string $thumbnailFileName
  * @param string $thumbnailFileTmp
- * @return string|null
+ * @return string
  */
-function imagesFileHandler(string $thumbnailFileName, string $thumbnailFileTmp): ?string
-{
-
+function imagesFileHandler(string $thumbnailFileName, string $thumbnailFileTmp){
     $fileExtThumb = explode('.', $thumbnailFileName);
     $fileActualExtThumb = strtolower(end($fileExtThumb));
 
-    $allowedFileTypeThumbnail = array('gif', 'jpeg', 'png', 'svg', 'jpg', 'jfif', 'pjpeg', 'pjp', 'webp');
+    $headerType = mime_content_type($thumbnailFileTmp);
+    $headerTypeMatch = array('image/png', 'image/jpeg','image/gif', 'image/svg+xml',);
 
-    if(in_array($fileActualExtThumb,$allowedFileTypeThumbnail)){
+    if(in_array($headerType,$headerTypeMatch)){
         $thumbnailFileNewName = uniqid("", true). "." .  $fileActualExtThumb;
         if(empty($thumbnailFileName)){
             header("location: ../../../Frontend/index.php?error=emptyFile");
@@ -48,6 +46,8 @@ function imagesFileHandler(string $thumbnailFileName, string $thumbnailFileTmp):
         }
         rename($thumbnailFileTmp,"../../../Frontend/images/".$thumbnailFileNewName);
         return $thumbnailFileNewName;
+    }else{
+        header("location: location: ../../../Frontend/index.php?error=Wrong%20File%20Type");
     }
     return NULL;
 }
\ No newline at end of file