diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d8fb79..eec008a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@
 ### Added
 - Added ability to [track views](https://plugins.doublesecretagency.com/ad-wizard/tracking-views/) via JavaScript. ([#50](https://github.com/doublesecretagency/craft-adwizard/pull/50), thanks @cballenar)
 
+### Fixed
+- Fixed bug encountered when saving an Ad Group without a field layout. ([#51](https://github.com/doublesecretagency/craft-adwizard/issues/51))
+
 ## 4.0.0 - 2024-02-22
 
 ### Changed
diff --git a/src/controllers/AdGroupsController.php b/src/controllers/AdGroupsController.php
index 02023e3..77c15f9 100644
--- a/src/controllers/AdGroupsController.php
+++ b/src/controllers/AdGroupsController.php
@@ -139,7 +139,7 @@ public function actionSaveGroup(): ?Response
 
         // Get POST values
         $group->id            = $request->getBodyParam('groupId');
-        $group->fieldLayoutId = $request->getBodyParam('fieldLayoutId');
+        $group->fieldLayoutId = $request->getBodyParam('fieldLayoutId') ?: null;
         $group->name          = $request->getBodyParam('name');
         $group->handle        = $request->getBodyParam('handle');