diff --git a/src/Forms/WidgetAreaEditor.php b/src/Forms/WidgetAreaEditor.php
index 9a6321d..cb5cd08 100644
--- a/src/Forms/WidgetAreaEditor.php
+++ b/src/Forms/WidgetAreaEditor.php
@@ -66,7 +66,7 @@ class WidgetAreaEditor extends FormField
                 $available = Config::inst()->get($class, 'only_available_in');
 
                 if (!empty($available) && is_array($available)) {
-                    if (in_array($this->Name, $available)) {
+                    if (in_array($this->Name, $available ?? [])) {
                         $widgets->push(singleton($class));
                     }
                 } else {
@@ -168,12 +168,12 @@ class WidgetAreaEditor extends FormField
                 if (empty($newWidgetData['Type'])) {
                     $newWidgetData['Type'] = '';
                 }
-                $newWidgetData['Type'] = str_replace('_', '\\', $newWidgetData['Type']);
+                $newWidgetData['Type'] = str_replace('_', '\\', $newWidgetData['Type'] ?? '');
 
                 // create a new object
                 if (!$widget
                     && !empty($newWidgetData['Type'])
-                    && class_exists($newWidgetData['Type'])
+                    && class_exists($newWidgetData['Type'] ?? '')
                     && is_subclass_of($newWidgetData['Type'], Widget::class)
                 ) {
                     $widget = Injector::inst()->create($newWidgetData['Type']);
diff --git a/src/Model/Widget.php b/src/Model/Widget.php
index 8864248..fcccf17 100644
--- a/src/Model/Widget.php
+++ b/src/Model/Widget.php
@@ -191,7 +191,7 @@ class Widget extends DataObject
             if ($value) {
                 $field->setValue($value);
             }
-            $namefiltered = preg_replace("/([A-Za-z0-9\-_]+)/", "Widget[" . $this->FormID . "][\\1]", $name);
+            $namefiltered = preg_replace("/([A-Za-z0-9\-_]+)/", "Widget[" . $this->FormID . "][\\1]", $name ?? '');
 
             $field->setName($namefiltered);
             $outputFields->push($field);
@@ -230,14 +230,14 @@ class Widget extends DataObject
             return $this->controller;
         }
 
-        foreach (array_reverse(ClassInfo::ancestry(get_class($this))) as $widgetClass) {
+        foreach (array_reverse(ClassInfo::ancestry(get_class($this)) ?? []) as $widgetClass) {
             $controllerClass = "{$widgetClass}Controller";
-            if (class_exists($controllerClass)) {
+            if (class_exists($controllerClass ?? '')) {
                 break;
             }
         }
 
-        if (!class_exists($controllerClass)) {
+        if (!class_exists($controllerClass ?? '')) {
             throw new Exception('Could not find controller class for ' . static::class);
         }
 
@@ -268,7 +268,7 @@ class Widget extends DataObject
 
         //Look for checkbox fields not present in the data
         foreach ($fields as $field) {
-            if ($field instanceof CheckboxField && !array_key_exists($field->getName(), $data)) {
+            if ($field instanceof CheckboxField && !array_key_exists($field->getName(), $data ?? [])) {
                 $field->setValue(false);
                 $field->saveInto($this);
             }
diff --git a/src/Model/WidgetController.php b/src/Model/WidgetController.php
index 606e444..944465d 100644
--- a/src/Model/WidgetController.php
+++ b/src/Model/WidgetController.php
@@ -106,7 +106,7 @@ class WidgetController extends Controller
      */
     public function Content()
     {
-        return $this->renderWith(array_reverse(ClassInfo::ancestry(get_class($this->widget))));
+        return $this->renderWith(array_reverse(ClassInfo::ancestry(get_class($this->widget)) ?? []));
     }
 
     /**
@@ -136,8 +136,8 @@ class WidgetController extends Controller
         $leftandmain->doInit();
 
         // Decode if fully qualified - @see Widget::ClassName
-        $className = str_replace('_', '\\', $this->urlParams['ID']);
-        if (class_exists($className) && is_subclass_of($className, Widget::class)) {
+        $className = str_replace('_', '\\', $this->urlParams['ID'] ?? '');
+        if (class_exists($className ?? '') && is_subclass_of($className, Widget::class)) {
             $obj = new $className();
             return $obj->EditableSegment();
         } else {