diff --git a/upload.php b/upload.php
index bb5010e..93349b8 100644
--- a/upload.php
+++ b/upload.php
@@ -47,14 +47,20 @@ if (!isZipFile($map["name"])) {
   die();
 }
 
-$fileHash = hash_file("sha256", $file); // the hash of the file
+$fileHash = null;
+try {
+  $fileHash = hash_file("sha256", $file); // the hash of the file
+} catch (Exception $e) {
+}
 
 $exists = false;
-foreach (scandir($target_dir) as $file) { // scan the maps directory for a file with the same hash
-  if (hash_file("sha256", $target_dir . $file) == $fileHash) {
-    $mapId = pathinfo($file, PATHINFO_FILENAME);
-    $exists = true;
-    break;
+if ($fileHash != null) {
+  foreach (scandir($target_dir) as $file) { // scan the maps directory for a file with the same hash
+    if (hash_file("sha256", $target_dir . $file) == $fileHash) {
+      $mapId = pathinfo($file, PATHINFO_FILENAME);
+      $exists = true;
+      break;
+    }
   }
 }