diff --git a/application/controllers/UploaderController.php b/application/controllers/UploaderController.php
index 1e86dd33b2d..3801796d370 100644
--- a/application/controllers/UploaderController.php
+++ b/application/controllers/UploaderController.php
@@ -346,13 +346,19 @@ public function run($actionID)
 
         $fn = $sFieldName;
         $qid = (int) Yii::app()->request->getParam('qid');
-        $minfiles = (int) Yii::app()->request->getParam('minfiles');
-        $maxfiles = (int) Yii::app()->request->getParam('maxfiles');
         $qidattributes = QuestionAttribute::model()->getQuestionAttributes($qid);
         $qidattributes['max_filesize'] = floor(min(intval($qidattributes['max_filesize']), getMaximumFileUploadSize() / 1024));
         if ($qidattributes['max_filesize'] <= 0) {
             $qidattributes['max_filesize'] = getMaximumFileUploadSize() / 1024;
         }
+        $minfiles = "";
+        if (!empty($qidattributes['min_num_of_files'])) {
+            $minfiles = intval($qidattributes['min_num_of_files']);
+        }
+        $maxfiles = "";
+        if (!empty($qidattributes['max_num_of_files'])) {
+            $maxfiles = intval($qidattributes['max_num_of_files']);
+        }
         $aData = [
             'fn' => $fn,
             'qid' => $qid,