[BUGFIX] Fix Error for editor users on root page (uid = 0)

Classes/Controller/BackendController.php

@@ -73,6 +73,10 @@ class BackendController extends ActionController {
 
 			// create docheader + buttons
 			$pageInfo = BackendUtility::readPageAccess($pageUid, $GLOBALS['BE_USER']->getPagePermsClause(1));
+			if ($pageInfo === FALSE) {
+				$pageInfo = ['uid' => $pageUid];
+			}
+
 			$this->docHeaderComponent = GeneralUtility::makeInstance(DocHeaderComponent::class);
 			$this->docHeaderComponent->setMetaInformation($pageInfo);
 			BackendService::makeButtons($this->docHeaderComponent, $this->request);