diff --git a/modules/backend/widgets/Filter.php b/modules/backend/widgets/Filter.php
index c37561a3f2..4df0ba8eb8 100644
--- a/modules/backend/widgets/Filter.php
+++ b/modules/backend/widgets/Filter.php
@@ -687,8 +687,8 @@ public function removeScope($scopeName)
      */
     protected function makeFilterScope($name, $config)
     {
-        $label = $config['label'] ?? null;
-        $scopeType = $config['type'] ?? null;
+        $label = $config['label'] ?? '';
+        $scopeType = $config['type'] ?? '';
 
         $scope = new FilterScope($name, $label);
         $scope->displayAs($scopeType, $config);
diff --git a/modules/backend/widgets/Lists.php b/modules/backend/widgets/Lists.php
index 8f13eaa3c6..a3c48befcf 100644
--- a/modules/backend/widgets/Lists.php
+++ b/modules/backend/widgets/Lists.php
@@ -926,7 +926,7 @@ protected function makeListColumn($name, $config)
             $config['searchable'] = false;
         }
 
-        $columnType = $config['type'] ?? null;
+        $columnType = $config['type'] ?? '';
 
         $column = new ListColumn($name, $label);
         $column->displayAs($columnType, $config);
diff --git a/modules/system/classes/SettingsManager.php b/modules/system/classes/SettingsManager.php
index 0f7993f8b8..affa52a1b0 100644
--- a/modules/system/classes/SettingsManager.php
+++ b/modules/system/classes/SettingsManager.php
@@ -357,7 +357,7 @@ public function getContext()
     {
         return (object) [
             'itemCode' => $this->contextItemCode,
-            'owner' => strtolower($this->aliases[$this->contextOwner] ?? $this->contextOwner),
+            'owner' => strtolower($this->aliases[$this->contextOwner] ?? ($this->contextOwner ?? '')),
         ];
     }
 
diff --git a/modules/system/helpers/DateTime.php b/modules/system/helpers/DateTime.php
index 9401dfb5b1..2fc289918f 100644
--- a/modules/system/helpers/DateTime.php
+++ b/modules/system/helpers/DateTime.php
@@ -130,6 +130,6 @@ public static function momentFormat($format)
             $replacements['\\'.$from] = '['.$from.']';
         }
 
-        return strtr($format, $replacements);
+        return strtr($format ?? '', $replacements);
     }
 }
diff --git a/modules/system/partials/_settings_menu_items.htm b/modules/system/partials/_settings_menu_items.htm
index bb9f7e0442..8bf68fd630 100644
--- a/modules/system/partials/_settings_menu_items.htm
+++ b/modules/system/partials/_settings_menu_items.htm
@@ -2,7 +2,7 @@
     $context = System\Classes\SettingsManager::instance()->getContext();
 
     $collapsedGroups = explode('|',
-        isset($_COOKIE['sidenav_treegroupStatus']) ? $_COOKIE['sidenav_treegroupStatus'] : null
+        isset($_COOKIE['sidenav_treegroupStatus']) ? $_COOKIE['sidenav_treegroupStatus'] : ''
     );
 
 ?>
@@ -28,4 +28,4 @@ <h3><?= e(trans($category)) ?></h3>
             </ul>
         </li>
     <?php endforeach ?>
-</ul>
\ No newline at end of file
+</ul>