diff --git a/Classes/Controller/PostController.php b/Classes/Controller/PostController.php
index 6f746e64..c637ed47 100644
--- a/Classes/Controller/PostController.php
+++ b/Classes/Controller/PostController.php
@@ -235,7 +235,10 @@ public function listPostsByCategoryAction(Category $category = null): void
             $this->view->assign('posts', $posts);
             $this->view->assign('category', $category);
             MetaTagService::set(MetaTagService::META_TITLE, (string) $category->getTitle());
-            MetaTagService::set(MetaTagService::META_DESCRIPTION, (string) $category->getDescription());
+
+            if (!empty($categoryDescription = (string) $category->getDescription())) {
+                MetaTagService::set(MetaTagService::META_DESCRIPTION, $categoryDescription);
+            }
         } else {
             $this->view->assign('categories', $this->categoryRepository->findAll());
         }
@@ -256,7 +259,10 @@ public function listPostsByAuthorAction(Author $author = null): void
             $this->view->assign('posts', $posts);
             $this->view->assign('author', $author);
             MetaTagService::set(MetaTagService::META_TITLE, (string) $author->getName());
-            MetaTagService::set(MetaTagService::META_DESCRIPTION, (string) $author->getBio());
+
+            if (!empty($authorBio = (string) $author->getBio())) {
+                MetaTagService::set(MetaTagService::META_DESCRIPTION, $authorBio);
+            }
         } else {
             $this->view->assign('authors', $this->authorRepository->findAll());
         }
@@ -277,7 +283,10 @@ public function listPostsByTagAction(Tag $tag = null): void
             $this->view->assign('posts', $posts);
             $this->view->assign('tag', $tag);
             MetaTagService::set(MetaTagService::META_TITLE, (string) $tag->getTitle());
-            MetaTagService::set(MetaTagService::META_DESCRIPTION, (string) $tag->getDescription());
+
+            if (!empty($tagDescription = (string) $tag->getDescription())) {
+                MetaTagService::set(MetaTagService::META_DESCRIPTION, $tagDescription);
+            }
         } else {
             $this->view->assign('tags', $this->tagRepository->findAll());
         }