diff --git a/.php_cs.dist.php b/.php_cs.dist.php
index 6f791684f..6b7c1ddb9 100644
--- a/.php_cs.dist.php
+++ b/.php_cs.dist.php
@@ -36,7 +36,7 @@ $riskyRules = [
     'php_unit_no_expectation_annotation' => false,
     'declare_strict_types' => false,
     'function_to_constant' => false,
-    'is_null' => false,
+    'is_null' => true,
     'native_function_invocation' => false,
     'ternary_to_elvis_operator' => false,
     //    'no_trailing_whitespace_in_string' => false,
diff --git a/src/Bundle/ChillMainBundle/Export/ExportManager.php b/src/Bundle/ChillMainBundle/Export/ExportManager.php
index 954658b81..70ba2881f 100644
--- a/src/Bundle/ChillMainBundle/Export/ExportManager.php
+++ b/src/Bundle/ChillMainBundle/Export/ExportManager.php
@@ -520,8 +520,8 @@ class ExportManager
         if ($element instanceof ExportInterface || $element instanceof DirectExportInterface) {
             $role = $element->requiredRole();
         } elseif ($element instanceof ModifierInterface) {
-            if (is_null($element->addRole())) {
-                if (is_null($export)) {
+            if (null === $element->addRole()) {
+                if (null === $export) {
                     throw new LogicException('The export should not be null: as the '
                             . 'ModifierInstance element is not an export, we should '
                             . 'be aware of the export to determine which role is required');
diff --git a/src/Bundle/ChillMainBundle/Export/Formatter/SpreadSheetFormatter.php b/src/Bundle/ChillMainBundle/Export/Formatter/SpreadSheetFormatter.php
index 71119205e..3646c9610 100644
--- a/src/Bundle/ChillMainBundle/Export/Formatter/SpreadSheetFormatter.php
+++ b/src/Bundle/ChillMainBundle/Export/Formatter/SpreadSheetFormatter.php
@@ -342,20 +342,17 @@ class SpreadSheetFormatter implements FormatterInterface
 
         switch ($this->formatterData['format']) {
             case 'ods':
-                $writer = \PhpOffice\PhpSpreadsheet\IOFactory
-                    ::createWriter($spreadsheet, 'Ods');
+                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Ods');
 
                 break;
 
             case 'xlsx':
-                $writer = \PhpOffice\PhpSpreadsheet\IOFactory
-                    ::createWriter($spreadsheet, 'Xlsx');
+                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx');
 
                 break;
 
             case 'csv':
-                $writer = \PhpOffice\PhpSpreadsheet\IOFactory
-                    ::createWriter($spreadsheet, 'Csv');
+                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Csv');
 
                 break;
 
diff --git a/src/Bundle/ChillMainBundle/Export/Formatter/SpreadsheetListFormatter.php b/src/Bundle/ChillMainBundle/Export/Formatter/SpreadsheetListFormatter.php
index e4fb8cf19..17bb8380e 100644
--- a/src/Bundle/ChillMainBundle/Export/Formatter/SpreadsheetListFormatter.php
+++ b/src/Bundle/ChillMainBundle/Export/Formatter/SpreadsheetListFormatter.php
@@ -167,23 +167,20 @@ class SpreadsheetListFormatter implements FormatterInterface
 
         switch ($this->formatterData['format']) {
             case 'ods':
-                $writer = \PhpOffice\PhpSpreadsheet\IOFactory
-                    ::createWriter($spreadsheet, 'Ods');
+                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Ods');
                 $contentType = 'application/vnd.oasis.opendocument.spreadsheet';
 
                 break;
 
             case 'xlsx':
-                $writer = \PhpOffice\PhpSpreadsheet\IOFactory
-                    ::createWriter($spreadsheet, 'Xlsx');
+                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx');
                 $contentType = 'application/vnd.openxmlformats-officedocument.'
                     . 'spreadsheetml.sheet';
 
                 break;
 
             case 'csv':
-                $writer = \PhpOffice\PhpSpreadsheet\IOFactory
-                    ::createWriter($spreadsheet, 'Csv');
+                $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Csv');
                 $contentType = 'text/csv';
 
                 break;
diff --git a/src/Bundle/ChillMainBundle/Validation/Validator/RoleScopeScopePresence.php b/src/Bundle/ChillMainBundle/Validation/Validator/RoleScopeScopePresence.php
index 09c03f3ef..bce230ebb 100644
--- a/src/Bundle/ChillMainBundle/Validation/Validator/RoleScopeScopePresence.php
+++ b/src/Bundle/ChillMainBundle/Validation/Validator/RoleScopeScopePresence.php
@@ -69,7 +69,7 @@ class RoleScopeScopePresence extends ConstraintValidator
         } elseif // if the scope should be null
             (
                 in_array($value->getRole(), $this->roleProvider->getRolesWithoutScopes())
-                && !is_null($value->getScope())
+                && null !== $value->getScope()
             ) {
             $this->context->buildViolation($constraint->messageNullRequired)
                 ->setParameter('%role%', $this->translator->trans($value->getRole()))
diff --git a/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php b/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php
index 01f72ceb1..ef50057a0 100644
--- a/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php
+++ b/src/Bundle/ChillPersonBundle/Controller/HouseholdMemberController.php
@@ -183,7 +183,7 @@ class HouseholdMemberController extends ApiController
                     $_format,
                     ['groups' => ['read']]
                 );
-        } catch (Exception\InvalidArgumentException | Exception\UnexpectedValueException $e) {
+        } catch (Exception\InvalidArgumentException|Exception\UnexpectedValueException $e) {
             throw new BadRequestException("Deserialization error: {$e->getMessage()}", 45896, $e);
         }