diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 88dae9b..7d13da1 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.27 under development
 ------------------------
 
+- Bug #17539: Fixed error when using `batch()` with `indexBy()` with MSSQL (alexkart)
 - Bug #17549: Fix `yii\db\ExpressionInterface` not supported in `yii\db\conditions\SimpleConditionBuilder` (razvanphp)
 - Bug #17434: Fix regular expression illegal character; Repeated fix for Internet Explorer 11 AJAX redirect bug in case of 301 and 302 response codes (`XMLHttpRequest: Network Error 0x800c0008`) (kamarton)
 - Bug #16855: Ignore console commands that have no actions (alexeevdv)
diff --git a/framework/db/BatchQueryResult.php b/framework/db/BatchQueryResult.php
index 4dd9723..68fd03f 100644
--- a/framework/db/BatchQueryResult.php
+++ b/framework/db/BatchQueryResult.php
@@ -214,8 +214,11 @@ class BatchQueryResult extends BaseObject implements \Iterator
             return $this->db->driverName;
         }
 
-        if (isset($this->_batch[0]->db->driverName)) {
-            return $this->_batch[0]->db->driverName;
+        if (!empty($this->_batch)) {
+            $key = array_keys($this->_batch)[0];
+            if (isset($this->_batch[$key]->db->driverName)) {
+                return $this->_batch[$key]->db->driverName;
+            }
         }
 
         return null;
diff --git a/tests/framework/db/BatchQueryResultTest.php b/tests/framework/db/BatchQueryResultTest.php
index 24d9fde..4fbae97 100644
--- a/tests/framework/db/BatchQueryResultTest.php
+++ b/tests/framework/db/BatchQueryResultTest.php
@@ -36,13 +36,13 @@ abstract class BatchQueryResultTest extends DatabaseTestCase
         $query = new Query();
         $query->from('customer')->orderBy('id');
         $batch = $query->batch(2, $db);
-        $allRows = $this->getAllRowsFromBach($batch);
+        $allRows = $this->getAllRowsFromBatch($batch);
         $this->assertCount(3, $allRows);
         $this->assertEquals('user1', $allRows[0]['name']);
         $this->assertEquals('user2', $allRows[1]['name']);
         $this->assertEquals('user3', $allRows[2]['name']);
         // rewind
-        $allRows = $this->getAllRowsFromBach($batch);
+        $allRows = $this->getAllRowsFromBatch($batch);
         $this->assertCount(3, $allRows);
         // reset
         $batch->reset();
@@ -60,7 +60,7 @@ abstract class BatchQueryResultTest extends DatabaseTestCase
         // query with index
         $query = new Query();
         $query->from('customer')->indexBy('name');
-        $allRows = $this->getAllRowsFromBach($query->batch(2, $db));
+        $allRows = $this->getAllRowsFromBatch($query->batch(2, $db));
         $this->assertCount(3, $allRows);
         $this->assertEquals('address1', $allRows['user1']['address']);
         $this->assertEquals('address2', $allRows['user2']['address']);
@@ -90,7 +90,7 @@ abstract class BatchQueryResultTest extends DatabaseTestCase
         $db = $this->getConnection();
 
         $query = Customer::find()->orderBy('id');
-        $customers = $this->getAllRowsFromBach($query->batch(2, $db));
+        $customers = $this->getAllRowsFromBatch($query->batch(2, $db));
         $this->assertCount(3, $customers);
         $this->assertEquals('user1', $customers[0]->name);
         $this->assertEquals('user2', $customers[1]->name);
@@ -98,7 +98,7 @@ abstract class BatchQueryResultTest extends DatabaseTestCase
 
         // batch with eager loading
         $query = Customer::find()->with('orders')->orderBy('id');
-        $customers = $this->getAllRowsFromBach($query->batch(2, $db));
+        $customers = $this->getAllRowsFromBatch($query->batch(2, $db));
         foreach ($customers as $customer) {
             $this->assertTrue($customer->isRelationPopulated('orders'));
         }
@@ -111,14 +111,24 @@ abstract class BatchQueryResultTest extends DatabaseTestCase
     public function testBatchWithoutDbParameter()
     {
         $query = Customer::find()->orderBy('id')->limit(3);
-        $customers = $this->getAllRowsFromBach($query->batch(2));
+        $customers = $this->getAllRowsFromBatch($query->batch(2));
         $this->assertCount(3, $customers);
         $this->assertEquals('user1', $customers[0]->name);
         $this->assertEquals('user2', $customers[1]->name);
         $this->assertEquals('user3', $customers[2]->name);
     }
 
-    protected function getAllRowsFromBach(BatchQueryResult $batch)
+    public function testBatchWithIndexBy()
+    {
+        $query = Customer::find()->orderBy('id')->limit(3)->indexBy('id');
+        $customers = $this->getAllRowsFromBatch($query->batch(2));
+        $this->assertCount(3, $customers);
+        $this->assertEquals('user1', $customers[0]->name);
+        $this->assertEquals('user2', $customers[1]->name);
+        $this->assertEquals('user3', $customers[2]->name);
+    }
+
+    protected function getAllRowsFromBatch(BatchQueryResult $batch)
     {
         $allRows = [];
         foreach ($batch as $rows) {