diff --git a/application/Espo/Core/Utils/Acl/UserAclManagerProvider.php b/application/Espo/Core/Utils/Acl/UserAclManagerProvider.php
index f572ead9fd..b6d97134d7 100644
--- a/application/Espo/Core/Utils/Acl/UserAclManagerProvider.php
+++ b/application/Espo/Core/Utils/Acl/UserAclManagerProvider.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Utils\Acl;
 
 use Espo\Entities\User;
+use Espo\Entities\Portal;
 use Espo\ORM\EntityManager;
 use Espo\Core\AclManager;
 use Espo\Core\Portal\AclManagerContainer as PortalAclManagerContainer;
@@ -78,6 +79,7 @@ class UserAclManagerProvider
         $aclManager = $this->aclManager;
 
         if ($user->isPortal() && !$this->user->isPortal()) {
+            /** @var ?Portal */
             $portal = $this->entityManager
                 ->getRDBRepository(User::ENTITY_TYPE)
                 ->getRelation($user, 'portals')
diff --git a/application/Espo/Core/Utils/File/Manager.php b/application/Espo/Core/Utils/File/Manager.php
index ef47d02f7b..4c93925380 100644
--- a/application/Espo/Core/Utils/File/Manager.php
+++ b/application/Espo/Core/Utils/File/Manager.php
@@ -94,7 +94,7 @@ class Manager
      * If TRUE - returns only file list, if FALSE - only directory list.
      * @param bool $returnSingleArray Return a single array.
      *
-     * @return array<int, string>|array<int, string[]>
+     * @return array<int, string>|array<string, string[]>
      */
     public function getFileList(
         string $path,
@@ -267,7 +267,7 @@ class Manager
                 return $data;
             }
 
-            usleep(self::GET_SAFE_CONTENTS_RETRY_INTERVAL * 1000000);
+            usleep((int) (self::GET_SAFE_CONTENTS_RETRY_INTERVAL * 1000000));
 
             $counter ++;
         }
@@ -370,7 +370,7 @@ class Manager
                 return true;
             }
 
-            usleep(self::RENAME_RETRY_INTERVAL * 1000000);
+            usleep((int) (self::RENAME_RETRY_INTERVAL * 1000000));
 
             $counter++;
         }
diff --git a/application/Espo/Core/Utils/File/Permission.php b/application/Espo/Core/Utils/File/Permission.php
index 8f85c847a0..8e67073fb4 100644
--- a/application/Espo/Core/Utils/File/Permission.php
+++ b/application/Espo/Core/Utils/File/Permission.php
@@ -163,7 +163,7 @@ class Permission
 
         $fileInfo = stat($filePath);
 
-        return substr(base_convert($fileInfo['mode'], 10, 8), -4);
+        return substr(base_convert((string) $fileInfo['mode'], 10, 8), -4);
     }
 
     /**
diff --git a/application/Espo/Core/Utils/Util.php b/application/Espo/Core/Utils/Util.php
index 493ca4e1dc..5676ce1bf9 100644
--- a/application/Espo/Core/Utils/Util.php
+++ b/application/Espo/Core/Utils/Util.php
@@ -247,7 +247,7 @@ class Util
      * Get a full path of the file.
      *
      * @param string|array $folderPath
-     * @param string $filePath
+     * @param string|null $filePath
      *
      * @return string
      */