diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index c4807313d9..971f451269 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.12 under development
 --------------------------
 
+- Bug #13657: Fixed `yii\helpers\StringHelper::truncateHtml()` skip extra tags at the end (sam002)
 - Bug #7946 Fixed a bug when the `form` attribute was not propagated to the hidden input of the checkbox (Kolyunya)
 - Bug #13087: Fixed getting active validators for safe attribute (developeruz)
 - Bug #13571: Fix `yii\db\mssql\QueryBuilder::checkIntegrity` for all tables (boboldehampsink)
diff --git a/framework/helpers/BaseStringHelper.php b/framework/helpers/BaseStringHelper.php
index e06da6ed6e..3dca93158a 100644
--- a/framework/helpers/BaseStringHelper.php
+++ b/framework/helpers/BaseStringHelper.php
@@ -160,10 +160,8 @@ class BaseStringHelper
         $truncated = [];
         foreach ($tokens as $token) {
             if ($token instanceof \HTMLPurifier_Token_Start) { //Tag begins
-                if ($totalCount < $count) {
-                    $openTokens[$token->name] = isset($openTokens[$token->name]) ? $openTokens[$token->name] + 1 : 1;
-                    $truncated[] = $token;
-                }
+                $openTokens[$token->name] = isset($openTokens[$token->name]) ? $openTokens[$token->name] + 1 : 1;
+                $truncated[] = $token;
             } elseif ($token instanceof \HTMLPurifier_Token_Text && $totalCount <= $count) { //Text
                 if (false === $encoding) {
                     preg_match('/^(\s*)/um', $token->data, $prefixSpace) ?: $prefixSpace = ['',''];
@@ -178,12 +176,23 @@ class BaseStringHelper
             } elseif ($token instanceof \HTMLPurifier_Token_End) { //Tag ends
                 if (!empty($openTokens[$token->name])) {
                     $openTokens[$token->name]--;
+                    if ($openTokens[$token->name] <= 0) {
+                        unset($openTokens[$token->name]);
+                    }
                     $truncated[] = $token;
                 }
             } elseif ($token instanceof \HTMLPurifier_Token_Empty) { //Self contained tags, i.e. <img/> etc.
                 $truncated[] = $token;
             }
-            if (0 === $openTokens && $totalCount >= $count) {
+            if ($totalCount >= $count) {
+                if (0 < count($openTokens)) {
+                    foreach (array_reverse($openTokens) as $name => $countTag) {
+                        while ($countTag > 0) {
+                            $truncated[] = new \HTMLPurifier_Token_End($name);
+                            $countTag--;
+                        }
+                    }
+                }
                 break;
             }
         }
diff --git a/tests/framework/helpers/StringHelperTest.php b/tests/framework/helpers/StringHelperTest.php
index 1e505871b1..27a060d207 100644
--- a/tests/framework/helpers/StringHelperTest.php
+++ b/tests/framework/helpers/StringHelperTest.php
@@ -117,6 +117,8 @@ class StringHelperTest extends TestCase
         $this->assertEquals('<span><img src="image.png" />This is a test </span><strong>for</strong>...', StringHelper::truncate('<span><img src="image.png" />This is a test </span><strong>for a sentance</strong>', 18, '...', null, true));
 
         $this->assertEquals('<p>This is a test</p><ul><li>bullet1</li><li>b</li></ul>...', StringHelper::truncate('<p>This is a test</p><ul><li>bullet1</li><li>bullet2</li><li>bullet3</li><li>bullet4</li></ul>', 22, '...', null, true));
+
+        $this->assertEquals('<div><ul><li>bullet1</li><li>b</li></ul></div>...', StringHelper::truncate('<div><ul><li>bullet1</li><li>bullet2</li><li>bullet3</li></ul><br></div>', 8, '...', null, true));
     }
 
     public function testTruncateWords()