prevent php-warnings, fixes #4823

Closes #4823

Merge request studip/studip!3608

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/models/File.php b/lib/models/File.php
index 6cd0151..603a228 100644
--- a/lib/models/File.php
+++ b/lib/models/File.php
@@ -87,7 +87,7 @@ class File extends SimpleORMap
      */
     public function deleteDataFile()
     {
-        return @unlink($this->getPath());
+        return file_exists($this->getPath()) && unlink($this->getPath());
     }
 
     /**
@@ -107,7 +107,7 @@ class File extends SimpleORMap
             if (!@move_uploaded_file($path_to_file, $newpath)) {
                 return false;
             }
-        } else if (!@copy($path_to_file, $newpath)) {
+        } else if (!file_exists($path_to_file) || !@copy($path_to_file, $newpath)) {
             return false;
         }
         $this->size = filesize($newpath);