diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 46bfd2f369..d9ae43ce8e 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -6,6 +6,7 @@ Yii Framework 2 Change Log
 
 - Bug #8723: Fixed `yii\helpers\VarDumper::export()` unable to export circle referenced objects with `Closure` (klimov-paul)
 - Bug #9108: Negative number resulted in no formatting when using `Formatter::asSize()` or `Formatter::asShortSize` (nxnx, cebe)
+- Bug #9288: Fixed `FileHelper::createDirectory` directory creation to be concurrency friendly (dynasource)
 - Bug #9314: Fixed `yii\rbac\DbManager::getPermissionsByUser()` not returning permissions directly assigned to a user (hesna)
 - Bug #9415: Fixed regression in 2.0.6 where on Oracle DB `PDO::ATTR_CASE = PDO::CASE_LOWER` did not work anymore (cebe)
 - Bug #9442: Fixed `yii\db\Migration::renameTable()` caused fatal error when using SQLite driver (fetus-hina)
diff --git a/framework/helpers/BaseFileHelper.php b/framework/helpers/BaseFileHelper.php
index 749dc25cfd..bb740c5ddc 100644
--- a/framework/helpers/BaseFileHelper.php
+++ b/framework/helpers/BaseFileHelper.php
@@ -462,6 +462,9 @@ class BaseFileHelper
             $result = mkdir($path, $mode);
             chmod($path, $mode);
         } catch (\Exception $e) {
+            if(is_dir($path)){ // #9288
+                return true;
+            }
             throw new \yii\base\Exception("Failed to create directory '$path': " . $e->getMessage(), $e->getCode(), $e);
         }