diff --git a/core/lib/Thelia/Model/Country.php b/core/lib/Thelia/Model/Country.php
index 9d94c6824..ccaabd79b 100644
--- a/core/lib/Thelia/Model/Country.php
+++ b/core/lib/Thelia/Model/Country.php
@@ -102,7 +102,7 @@ class Country extends BaseCountry
         if (null === self::$defaultCountry) {
             self::$defaultCountry = CountryQuery::create()->findOneByByDefault(true);
 
-            if (self::$defaultCountry == null) {
+            if (null === self::$defaultCountry) {
                 throw new \LogicException(Translator::getInstance()->trans("Cannot find a default country. Please define one."));
             }
         }
diff --git a/core/lib/Thelia/Model/Currency.php b/core/lib/Thelia/Model/Currency.php
index 6a19088f7..d12bbd2ea 100644
--- a/core/lib/Thelia/Model/Currency.php
+++ b/core/lib/Thelia/Model/Currency.php
@@ -22,7 +22,7 @@ class Currency extends BaseCurrency
 
             self::$defaultCurrency = CurrencyQuery::create()->findOneByByDefault(1);
 
-            if (self::$defaultCurrency == null) {
+            if (null === self::$defaultCurrency) {
                 throw new \RuntimeException("No default currency is defined. Please define one.");
             }
         }
diff --git a/core/lib/Thelia/Model/Lang.php b/core/lib/Thelia/Model/Lang.php
index 546eb7b20..42041941c 100644
--- a/core/lib/Thelia/Model/Lang.php
+++ b/core/lib/Thelia/Model/Lang.php
@@ -30,7 +30,9 @@ class Lang extends BaseLang
         if (null === self::$defaultLanguage) {
             self::$defaultLanguage = LangQuery::create()->findOneByByDefault(1);
 
-            if (self::$defaultLanguage == null) throw new \RuntimeException("No default language is defined. Please define one.");
+            if (null === self::$defaultLanguage) {
+                throw new \RuntimeException("No default language is defined. Please define one.");
+            }
         }
 
         return self::$defaultLanguage;