diff --git a/application/Espo/Core/Utils/Autoload.php b/application/Espo/Core/Utils/Autoload.php
index ee3ac69621..a2b8c3ec55 100644
--- a/application/Espo/Core/Utils/Autoload.php
+++ b/application/Espo/Core/Utils/Autoload.php
@@ -163,7 +163,7 @@ class Autoload
         try {
             $data = $this->getData();
         }
-        catch (Exception $e) {} // bad permissions
+        catch (Exception) {} // bad permissions
 
         if (empty($data)) {
             return;
diff --git a/application/Espo/Core/Utils/Crypt.php b/application/Espo/Core/Utils/Crypt.php
index 51832bbbc4..11918d0a36 100644
--- a/application/Espo/Core/Utils/Crypt.php
+++ b/application/Espo/Core/Utils/Crypt.php
@@ -62,7 +62,6 @@ class Crypt
                 throw new RuntimeException("openssl extension is not loaded.");
             }
 
-            /** @var string $iv */
             $iv = openssl_random_pseudo_bytes(16);
 
             $this->iv = $iv;
diff --git a/application/Espo/Core/Utils/DataCache.php b/application/Espo/Core/Utils/DataCache.php
index f0abde9ff2..24f6d3ba4b 100644
--- a/application/Espo/Core/Utils/DataCache.php
+++ b/application/Espo/Core/Utils/DataCache.php
@@ -82,7 +82,7 @@ class DataCache
         $result = $this->fileManager->putPhpContents($cacheFile, $data, true, true);
 
         if ($result === false) {
-            throw new RuntimeException("Could not store '{$key}'.");
+            throw new RuntimeException("Could not store '$key'.");
         }
     }
 
diff --git a/application/Espo/Core/Utils/DateTime.php b/application/Espo/Core/Utils/DateTime.php
index 8cc402ce45..0ad0da52d7 100644
--- a/application/Espo/Core/Utils/DateTime.php
+++ b/application/Espo/Core/Utils/DateTime.php
@@ -40,7 +40,6 @@ use DateTimeZone;
 use Exception;
 use RuntimeException;
 
-
 /**
  * Util for a date-time formatting and conversion.
  * Available as 'dateTime' service.
diff --git a/application/Espo/Core/Utils/Language.php b/application/Espo/Core/Utils/Language.php
index d6f88e7c63..1ebaab226f 100644
--- a/application/Espo/Core/Utils/Language.php
+++ b/application/Espo/Core/Utils/Language.php
@@ -231,7 +231,7 @@ class Language
                     continue;
                 }
 
-                $result &= $this->fileManager->mergeJsonContents($path . "/{$scope}.json", $data);
+                $result &= $this->fileManager->mergeJsonContents($path . "/$scope.json", $data);
             }
         }
 
@@ -241,7 +241,7 @@ class Language
                     continue;
                 }
 
-                $result &= $this->fileManager->unsetJsonContents($path . "/{$scope}.json", $unsetData);
+                $result &= $this->fileManager->unsetJsonContents($path . "/$scope.json", $unsetData);
             }
         }