diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec3c041ac..49e7d1dc9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Yii Framework 2 mongodb extension Change Log
 
 - Enh #294: Add transactions support (ziaratban)
 - Bug #299: Drop limit of `batchSize` cursor option in application level according to [jira.mongodb(PHP-457)](https://jira.mongodb.org/browse/PHP-457) (ziaratban)
+- Bug #297: Fixed zero-index key problem in `ActiveQuery::Each()` (ziaratban)
 
 
 2.1.12 August 09, 2021
diff --git a/src/BatchQueryResult.php b/src/BatchQueryResult.php
index 39a458575..0f568c4fd 100644
--- a/src/BatchQueryResult.php
+++ b/src/BatchQueryResult.php
@@ -110,7 +110,7 @@ public function next()
             if ($this->query->indexBy !== null) {
                 $this->_key = key($this->_batch);
             } elseif (key($this->_batch) !== null) {
-                $this->_key++;
+                $this->_key = $this->_key === null ? 0 : $this->_key + 1;
             } else {
                 $this->_key = null;
             }