diff --git a/main/gradebook/gradebook_add_eval.php b/main/gradebook/gradebook_add_eval.php
index 3959ec0a01..bdc3ca7a39 100644
--- a/main/gradebook/gradebook_add_eval.php
+++ b/main/gradebook/gradebook_add_eval.php
@@ -71,7 +71,8 @@ if ($form->validate()) {
 			exit;
 		}
 	} else {
-		if ($values['addresult'] == 1) {
+		$val_addresult=isset($values['addresult'])?$values['addresult']:null;
+		if ($val_addresult == 1) {
 			header('Location: gradebook_add_result.php?selecteval=' . $eval->get_id());
 			exit;
 		} else {
diff --git a/main/gradebook/gradebook_add_link.php b/main/gradebook/gradebook_add_link.php
index eb0096eb1e..11578b6c07 100644
--- a/main/gradebook/gradebook_add_link.php
+++ b/main/gradebook/gradebook_add_link.php
@@ -113,8 +113,8 @@ if (isset($_GET['typeselected']) && $_GET['typeselected'] != '0') {
 		} else {
 			$link->add();
 		}
-
-		if ($addvalues['addresult'] == 1) {
+		$addvalue_result=!empty($addvalues['addresult'])?$addvalues['addresult']:array();
+		if ($addvalue_result == 1) {
 			header('Location: gradebook_add_result.php?selecteval=' . $link->get_ref_id());
 			exit;
 		} else {