diff --git a/src/Form/LinkField.php b/src/Form/LinkField.php
index fcc5eeaa..fef8deac 100644
--- a/src/Form/LinkField.php
+++ b/src/Form/LinkField.php
@@ -6,11 +6,12 @@
 use SilverStripe\LinkField\Models\Link;
 use SilverStripe\LinkField\Form\Traits\AllowedLinkClassesTrait;
 use SilverStripe\LinkField\Form\Traits\LinkFieldGetOwnerTrait;
+use SilverStripe\Forms\HasOneRelationFieldInterface;
 
 /**
  * Allows CMS users to edit a Link object.
  */
-class LinkField extends FormField
+class LinkField extends FormField implements HasOneRelationFieldInterface
 {
     use AllowedLinkClassesTrait;
     use LinkFieldGetOwnerTrait;
diff --git a/src/Form/Traits/LinkFieldGetOwnerTrait.php b/src/Form/Traits/LinkFieldGetOwnerTrait.php
index 8740c844..575a4bf2 100644
--- a/src/Form/Traits/LinkFieldGetOwnerTrait.php
+++ b/src/Form/Traits/LinkFieldGetOwnerTrait.php
@@ -27,8 +27,12 @@ private function getOwnerFields(): array
         $relation = $this->getName();
         // Elemental content block
         if (class_exists(BaseElement::class) && is_a($owner, BaseElement::class)) {
+            // Remove namespaces from inline editable blocks
+            // This will return an empty array for non-inline editable blocks (e.g. blocks in a gridfield)
             $arr = ElementalAreaController::removeNamespacesFromFields([$relation => ''], $owner->ID);
-            $relation = array_keys($arr)[0];
+            if (!empty($arr)) {
+                $relation = array_key_first($arr);
+            }
         }
         return [
             'ID' => $owner->ID,