Order/Form: documents can be uploaded even if order is closed already

lib/mvcfronk/mfUpload/mfUpload.php

@@ -37,7 +37,7 @@ class mfUpload {
 		}
     
     if($randomFileName) {
-      $this->filename = $this->getRandomFilename().'-'.$this->filename;
+      $this->filename = self::getRandomFilename().'-'.$this->filename;
     }
 		
 		$this->size = $this->upload->getFileSize();
@@ -184,7 +184,7 @@ class mfUpload {
     return true;
 	}
 	
-	public function getRandomFilename() {
+	public static function getRandomFilename() {
 		$length = 20;
     $characters = '0123456789abcdef';
     $string = '';