[BUGFIX] Cope with negative PID when adding new CEs

Resolves: #11

Classes/TcaEnhancer.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace SkillDisplay\SkilldisplayContent;
 
 use SkillDisplay\PHPToolKit\Entity\Campaign;
+use TYPO3\CMS\Backend\Utility\BackendUtility;
 
 class TcaEnhancer
 {
@@ -25,9 +26,9 @@ class TcaEnhancer
             ['', 0],
         ];
 
-        $campaigns = $this->campaignsFactory
-            ->createFromPageUid($params['row']['pid'])
-            ->getForUser();
+        $pid = BackendUtility::getTSconfig_pidValue('tt_content', $params['row']['uid'], $params['row']['pid']);
+        if ($pid > 0) {
+            $campaigns = $this->campaignsFactory->createFromPageUid($pid)->getForUser();
             /** @var Campaign $campaign */
             foreach ($campaigns as $campaign) {
                 $params['items'][] = [
@@ -36,4 +37,5 @@ class TcaEnhancer
                 ];
             }
         }
+    }
 }