check if #access property of local task is of type...

check if #access property of local task is of type Drupal\Core\Access\AccessResult, otherwhise check on boolean value

Closes #3512470

src/Plugin/Block/NavigationExtraLocalTasksBlock.php

@@ -95,7 +95,7 @@ class NavigationExtraLocalTasksBlock extends LocalTasksBlock implements Containe
     $local_task_links = [];
     foreach ($build['#primary'] as $primary_link) {
 
-      if (!$primary_link['#access']->isAllowed()) {
+      if (($primary_link['#access'] instanceof AccessResult && !$primary_link['#access']->isAllowed()) || !$primary_link['#access']) {
         continue;
       }
 
@@ -110,7 +110,7 @@ class NavigationExtraLocalTasksBlock extends LocalTasksBlock implements Containe
         ]);
 
         foreach ($build['#secondary'] as $secondary_link) {
-          if (!$secondary_link['#access']->isAllowed()) {
+          if (($secondary_link['#access'] instanceof AccessResult && !$secondary_link['#access']->isAllowed()) || !$secondary_link['#access']) {
             continue;
           }
           $local_task_link['below'][] = $secondary_link['#link'];