diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index a47c10d50f..03b0aef426 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.13 under development
 ------------------------
 
+- Bug #14902: Fixed PHP notice in `yii\web\MultipartFormDataParser` (olimsaidov)
 - Bug #14129: Fixed console help to properly work with tricky camelcased controller names (samdark, silverfire)
 - Enh #14126: Added variadic parameters support to DI container (SamMousa)
 - Enh #14087: Added `yii\web\View::registerCsrfMetaTags()` method that registers CSRF tags dynamically ensuring that caching doesn't interfere (RobinKamps)
diff --git a/framework/web/MultipartFormDataParser.php b/framework/web/MultipartFormDataParser.php
index 67a2eb7e73..0e70ceb86c 100644
--- a/framework/web/MultipartFormDataParser.php
+++ b/framework/web/MultipartFormDataParser.php
@@ -262,7 +262,8 @@ class MultipartFormDataParser extends BaseObject implements RequestParserInterfa
             $namePart = trim($namePart, ']');
             if ($namePart === '') {
                 $current[] = [];
-                $lastKey = array_pop(array_keys($current));
+                $keys = array_keys($current);
+                $lastKey = array_pop($keys);
                 $current = &$current[$lastKey];
             } else {
                 if (!isset($current[$namePart])) {